Stanley 10-789 FatMax Extreme Retractable Twin Blade Knife
The safety interlock nose allows for one blade to be in use while the other slider is in a locked position. They come supplied with both 2 standard & 2 hook blades. Instant blade changes are made easy with no tools required & the swing out blade storage compartment holds up to 5 spare blades.
The safety interlock nose allows for one blade to be in use while the other slider is in a locked position. They come supplied with both 2 standard & 2 hook blades. Instant blade changes are made easy with no tools required & the swing out blade storage compartment holds up to 5 spare blades.
The safety interlock nose allows for one blade to be in use while the other slider is in a locked position. They come supplied with both 2 standard & 2 hook blades. Instant blade changes are made easy with no tools required & the swing out blade storage compartment holds up to 5 spare blades.
The safety interlock nose allows for one blade to be in use while the other slider is in a locked position. They come supplied with both 2 standard & 2 hook blades. Instant blade changes are made easy with no tools required & the swing out blade storage compartment holds up to 5 spare blades.
in 31 offers
The lowest price for Stanley 10-789 FatMax Extreme Retractable Twin Blade Knife right now is $19.95 at eBay.com.au, compared across 22 retailers.
The all-time low was $17.50 on 9 July 2025 — today's price is 14% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 2 Nov 2026.
Last updated at 02/11/2026 06:30:31
Stanley Knife Fatmax PRO Twin Blade Retractable Utility with 4 Blades & Holster
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Stanley 10-789 Fatmax Extreme Retractable Twin Blade Knife
Delivery $8
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Stanley 10-789 Fatmax Extreme Retractable Twin Blade Knife
Free delivery between 4–9 Nov
Stanley FatMax Xtreme Twin Blade Retractable Knife 10-789
Delivery $12
Stanley FatMax Retractable Knife Twin Blade 175mm
Delivery between 6–10 Nov $14.50
Stanley FatMax Xtreme Twin Blade Retractable Knife 10-789
Delivery $10
STANLEY FATMAX PRO Twin-Blade Retractable Utility Knife 10-789
Free delivery
Stanley Knife Retractable Twin Blade Utility Knife FATMAX 10-789
Delivery $12.90
Stanley FATMAX Pro Twin-Blade Retractable Utility Knife 10-789
Delivery between 5–11 Nov $12.90
Stanley FatMax XTreme Retractable Twin Blade Knife
Delivery $10
originally posted on stanleytools.com
Great tool--ALWAYS keep it in my toolpouch or pocket, simply because I do not know what jobs I will be in for from day to day, working in remodeling. Two blades in one knife, easy changeout, in-tool storage; could not get more conveneint. Wish I could get a half dozen more of these bad boys, but can't seem to find them in stores anymore? (Bummer because I did something to my left blade where it does not want to stay open now...)Awesome and handy tool, nonetheless; definitely impresses coworkers!
originally posted on stanleytools.com
I use this extensively for roofing. The ease in shifting between a carbide-edged straight blade and a large hook blade saves me time and energy. The handle grip is easy on my large hands and the changing of blades could not be easier. Being able to carry nine blades (I carry four hook and five straight) plus the two in the ready position; always enough to get me through sever days on the roof. I would highly recommend this utility knife for anyone who needs to shift between blades. My fellow roofing friends all get their own after using mine. (My name is brightly painted on the knife so it doesn't get "lost."
originally posted on zoro.com
You have to be an engineer to replace the blade, I opened it and 4 pieces fell out, tried 25 minutes and couldnt put it back together, I threw it away. Good Knife but rediculously hard to put back together.
| Product dimensions | 24.13 x 26.67 x 5.08 cm; 230 Grams |
| Is discontinued by manufacturer | No |
| Style | Retractable |
| Power Source | hand_powered |
| Handle Material | Rubber |
Stanley Knife Fatmax PRO Twin Blade Retractable Utility with 4 Blades & Holster
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Stanley 10-789 Fatmax Extreme Retractable Twin Blade Knife
Delivery $8
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Stanley 10-789 Fatmax Extreme Retractable Twin Blade Knife
Free delivery between 4–9 Nov
Stanley FatMax Xtreme Twin Blade Retractable Knife 10-789
Delivery $12
Stanley FatMax Retractable Knife Twin Blade 175mm
Delivery between 6–10 Nov $14.50
Great tool--ALWAYS keep it in my toolpouch or pocket, simply because I do not know what jobs I will be in for from day to day, working in remodeling. Two blades in one knife, easy changeout, in-tool storage; could not get more conveneint. Wish I could get a half dozen more of these bad boys, but can't seem to find them in stores anymore? (Bummer because I did something to my left blade where it does not want to stay open now...)Awesome and handy tool, nonetheless; definitely impresses coworkers!
I use this extensively for roofing. The ease in shifting between a carbide-edged straight blade and a large hook blade saves me time and energy. The handle grip is easy on my large hands and the changing of blades could not be easier. Being able to carry nine blades (I carry four hook and five straight) plus the two in the ready position; always enough to get me through sever days on the roof. I would highly recommend this utility knife for anyone who needs to shift between blades. My fellow roofing friends all get their own after using mine. (My name is brightly painted on the knife so it doesn't get "lost."
You have to be an engineer to replace the blade, I opened it and 4 pieces fell out, tried 25 minutes and couldnt put it back together, I threw it away. Good Knife but rediculously hard to put back together.
We do below ground waterproofing. We are cutting different types of materials one after another to complete the installation of one waterproofing system. There is no constant switching from one utility knife to another. The duel purpose utility blades, saves us time, and time is money.
I had one of these knifes and someone helped themselves to it because it was such a great tool. So I loved this knife so much I went on a quest to find another because you could flip the cutting edges so quickly that you did not need to carry two or more knives in your tool belt. It carries the extra blades in the handle and plus the handle fits you hand so nicely that there's no fumbling around with it that you drop it or cut yourself. It makes quick work of sheetrock or roofing with a nice study pull. The blades are sharp and easy to replace. This is a great must-have tool in the tool pouch.
I own a company Roofing Contracting and the constant need for both hook and straight blade makes this a must have. Only dilemma being that the individual using, has to be smarter than the tool(not the case reading some of these reviews).
This knife is excellent. With one exception. The knife takes a size 10 t bit to open. You can not remove the packaging or insert first blades without one. One you have it apart and get the packaging off, it is a royal pain to put back together. However, once you do so, it works amazingly well. I would give 5 stars I not for the inconveniences of needing a t bit and the complication of putting it back together.
I'm a Carpenter by trade but I also do roofing and a number of other jobs and this knife is my constant companion. The straight blade is amazing all around all purpose kind of blade for sharpening pencils to slicing tyvek, and the curved or claw blade slices through shingles like butter. There is a compartment in the handle which allows you to store blades for the quick change out of blades at the drop of a hat. I absolutely love this knife. It will save you time and money on the job keep one in your pouch and you will see what I mean.
It is impossible to remove the packaging without taking the knife apart. Then it is not possible to put it back together again, because when you remove the packinging, which is totally entwined throughout the knife centre, all the parts come apart and cannot be refitted properly. There are no instructions online or with the product. Save yourself the hassle. Buy a cheaper throwaway knife. Be warned and see other online reviews.
This Knife is Great for Roofing has hook blade one side reg blade other sideHas storage for 6 blades and its easy to change blade when dull and Price from Zoro very good
| Product dimensions | 24.13 x 26.67 x 5.08 cm; 230 Grams |
| Is discontinued by manufacturer | No |
| Style | Retractable |
| Power Source | hand_powered |
| Handle Material | Rubber |
