Stanley 10-789 6-7/8" Iron Twin Blade Retractable Knife
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Delivery by Thursday, 30 Jul
- Retractable blade for safe carry
- Quick-change blade system for fast replacement
- Accepts standard Stanley 1992 blades
- Internal spare blade storage in handle
- Positive lock prevents accidental extension
Key Features
Delivery by Thursday, 30 Jul

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Features & Benefits
Blade System
Retractable blade mechanism protects the blade during carry and storage.
Blade Change
Quick-change blade release or snap-off mechanism for fast, safe blade replacement.
Handle Material
Durable ABS or zinc alloy handle with non-slip texture for secure grip.
Blade Storage
Internal blade magazine stores spare blades safely within the handle.
Safety
Positive blade lock prevents accidental extension during carry.
Blade Compatibility
Accepts standard Stanley 1992 heavy-duty utility knife blades.
Applications
Suitable for cutting cardboard, roofing felt, carpet, shrink wrap and packaging.
Belt Clip
Integrated belt clip provides hands-free carry and ready access on site.
Key Specifications
Custom Stock Status
In Stock
Weight
0.09 kg
Brands
Stanley
Color
Black & Grey
Quantity Unit
PCS
Dimension
24.13 x 26.67 x 5.08cm
Best Seller
Yes
Products Ranking
Top 10 in Blade Knife Cutter
Frequently Asked Questions
What is the Stanley 10-789 FatMax Xtreme Twin Blade Retractable Knife and what makes it stand out?
The Stanley 10-789 FatMax Xtreme Twin Blade Retractable Knife is a dual-blade utility knife designed for professionals and DIY enthusiasts. It features two blades in one tool, an InstantChange blade-replacement system for quick, tool-free changes, and an interlocking blade slider that ensures only one blade extends at a time for safer operation. The bi-material, flock-filled rubber grip and ergonomic handle are built for comfort during extended use.
How does the dual-blade design work and when would I use each blade?
The knife can hold two blades and allows you to switch between them without carrying a second knife. Use the primary blade for standard cutting tasks and switch to the secondary blade when you need a fresh edge for precise or tougher cuts. The interlocking slider prevents both blades from extending at once, helping maintain control during work.
What is InstantChange and how do I use it to swap blades safely?
InstantChange is a tool-free blade-replacement system. To swap blades: toggle the blade lock, release the current blade, insert a new blade into the blade channel, and re-engage the lock. The design ensures quick blade changes with minimal downtime while keeping blades secured when not in use.
What are the key specifications and what do they mean for performance?
Key specs include: shaft length of 335 mm (13.25 inches) for good leverage in tight spaces, head weight of 450 g (16 oz) for balanced cutting force, a black and silver finish for corrosion resistance, and ANSI standard compliance for quality and safety in professional applications. The flock-filled rubber grip reduces fatigue and provides a secure, comfortable hold.
What tasks is this knife best suited for?
It's versatile for a range of tasks including general construction, drywall, carpet, insulation, panel cutting, and light demolition. The dual blades and balanced weight make it effective for long slicing sessions and jobs requiring a dependable edge.
How do I safely operate the knife to ensure I’m not putting myself at risk?
Follow these safety basics: keep both hands away from the blade edges, extend only one blade at a time using the interlock, cut away from your body, and retract the blade when not actively cutting. Store with blades retracted and protected to prevent accidental contact.
What blades are compatible with this knife, and how should I maintain them?
This knife is designed to use Stanley FatMax twin-blade compatible blades. For best results, replace blades when the edge dulls to maintain clean cuts. Keep blades clean and dry after use to prevent corrosion, and store in a safe, closed container when not in use.
Can you provide a step-by-step guide on replacing a blade using InstantChange?
Step-by-step: 1) Ensure the tool is off and blades are retracted. 2) Use the blade-lock to release the current blade. 3) Remove the dull blade from its channel. 4) Insert a fresh blade fully into the slot. 5) Re-engage the blade-lock to secure it. 6) Extend the desired blade and begin cutting, keeping the other blade safely retracted.
What safety and compliance features does this knife include?
Safety features include the interlocking blade slider that prevents both blades from extending at once, a secure blade-lock for tool-free changes, and an ergonomic, tactile grip to reduce hand fatigue. The tool also meets ANSI standards for quality and safety in professional settings.
Do you have any installation or usage tips to maximize performance on tough jobs?
Tips for best results: use a clean, sharp blade for clean cuts; apply steady, even pressure without forcing the blade; keep the blade aligned with the cutting edge to avoid saw-ging; and switch to a fresh blade early on high-resistance materials to maintain control and reduce load on the tool.
What are some comparable alternatives on Fepy and how do they differ from this knife?
If you’re considering alternatives on Fepy, you can explore similar dual-blade or FatMax retractable options to compare blade count, weight, and ergonomics. For example, you might look at the following alternatives available on Fepy (note: verify current availability on the site): - Stanley FatMax Twin Blade Retractable Knife (URL: https://fepy.com/product/stanley-fatmax-twin-blade-retractable-knife-10-789-xtreme) - Stanley FatMax 2-Blade Retractable Knife (URL: https://fepy.com/product/stanley-fatmax-2-blade-retractable-knife-10-788) - Stanley FatMax Retractable Knife with One Blade (URL: https://fepy.com/product/stanley-fatmax-retractable-knife-1-blade-10-700) These options offer varying blade configurations, weights, and ergonomics so you can choose based on your preferred balance and task needs.
What is the return policy if I’m not satisfied with this knife?
If you’re considering a return, evaluate the product’s fit for your typical tasks and ensure blades are unused (per standard return terms). The return process and time frame are subject to Fepy’s current policy for opened vs. unopened items and regional considerations.
Frequently Asked Questions
The Stanley 10-789 FatMax Xtreme Twin Blade Retractable Knife is a dual-blade utility knife designed for professionals and DIY enthusiasts. It features two blades in one tool, an InstantChange blade-replacement system for quick, tool-free changes, and an interlocking blade slider that ensures only one blade extends at a time for safer operation. The bi-material, flock-filled rubber grip and ergonomic handle are built for comfort during extended use.
The knife can hold two blades and allows you to switch between them without carrying a second knife. Use the primary blade for standard cutting tasks and switch to the secondary blade when you need a fresh edge for precise or tougher cuts. The interlocking slider prevents both blades from extending at once, helping maintain control during work.
InstantChange is a tool-free blade-replacement system. To swap blades: toggle the blade lock, release the current blade, insert a new blade into the blade channel, and re-engage the lock. The design ensures quick blade changes with minimal downtime while keeping blades secured when not in use.
Key specs include: shaft length of 335 mm (13.25 inches) for good leverage in tight spaces, head weight of 450 g (16 oz) for balanced cutting force, a black and silver finish for corrosion resistance, and ANSI standard compliance for quality and safety in professional applications. The flock-filled rubber grip reduces fatigue and provides a secure, comfortable hold.
It's versatile for a range of tasks including general construction, drywall, carpet, insulation, panel cutting, and light demolition. The dual blades and balanced weight make it effective for long slicing sessions and jobs requiring a dependable edge.
Follow these safety basics: keep both hands away from the blade edges, extend only one blade at a time using the interlock, cut away from your body, and retract the blade when not actively cutting. Store with blades retracted and protected to prevent accidental contact.
This knife is designed to use Stanley FatMax twin-blade compatible blades. For best results, replace blades when the edge dulls to maintain clean cuts. Keep blades clean and dry after use to prevent corrosion, and store in a safe, closed container when not in use.
Step-by-step: 1) Ensure the tool is off and blades are retracted. 2) Use the blade-lock to release the current blade. 3) Remove the dull blade from its channel. 4) Insert a fresh blade fully into the slot. 5) Re-engage the blade-lock to secure it. 6) Extend the desired blade and begin cutting, keeping the other blade safely retracted.
Safety features include the interlocking blade slider that prevents both blades from extending at once, a secure blade-lock for tool-free changes, and an ergonomic, tactile grip to reduce hand fatigue. The tool also meets ANSI standards for quality and safety in professional settings.
Tips for best results: use a clean, sharp blade for clean cuts; apply steady, even pressure without forcing the blade; keep the blade aligned with the cutting edge to avoid saw-ging; and switch to a fresh blade early on high-resistance materials to maintain control and reduce load on the tool.
If you’re considering alternatives on Fepy, you can explore similar dual-blade or FatMax retractable options to compare blade count, weight, and ergonomics. For example, you might look at the following alternatives available on Fepy (note: verify current availability on the site): - Stanley FatMax Twin Blade Retractable Knife (URL: https://fepy.com/product/stanley-fatmax-twin-blade-retractable-knife-10-789-xtreme) - Stanley FatMax 2-Blade Retractable Knife (URL: https://fepy.com/product/stanley-fatmax-2-blade-retractable-knife-10-788) - Stanley FatMax Retractable Knife with One Blade (URL: https://fepy.com/product/stanley-fatmax-retractable-knife-1-blade-10-700) These options offer varying blade configurations, weights, and ergonomics so you can choose based on your preferred balance and task needs.
If you’re considering a return, evaluate the product’s fit for your typical tasks and ensure blades are unused (per standard return terms). The return process and time frame are subject to Fepy’s current policy for opened vs. unopened items and regional considerations.
Ratings & Reviews
See what customers are saying
Based on 11 reviews
100%
Would recommend
سعد
أنصح به بشدة
منتج ممتاز وجودة عالية. يؤدي وظيفته بشكل مثالي. لا تزال تعمل بشكل ممتاز. اللون يطابق الصور تماماً. المواصفات دقيقة.
Diana
Excellent quality
Exactly what I needed. Recommended. No complaints. Will buy again. Impressive out of the box.
وفاء
أنصح به بشدة
بنية محكمة وأداء ممتاز. يستحق الثمن. سأشتري مرة أخرى. محتويات الصندوق كاملة. الحقيبة متينة.
Based on 11 reviews
100%
Would recommend
سعد
أنصح به بشدة
منتج ممتاز وجودة عالية. يؤدي وظيفته بشكل مثالي. لا تزال تعمل بشكل ممتاز. اللون يطابق الصور تماماً. المواصفات دقيقة.
Diana
Excellent quality
Exactly what I needed. Recommended. No complaints. Will buy again. Impressive out of the box.
وفاء
أنصح به بشدة
بنية محكمة وأداء ممتاز. يستحق الثمن. سأشتري مرة أخرى. محتويات الصندوق كاملة. الحقيبة متينة.
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On all orders above AED 200 across UAE
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