Editorial Product Review:Item Description:Retractable Utility Knife, Lightweight, Durable Aluminum, 3 Position Blade, 3 11-921 (Item #129650) Heavy Duty Blades, Blade Storage In Handle, Handle Length 6', Carded.
Amazon.com Item Description:The Stanley 6-Inch Classic 99 Retractable Utility Knife starts sharper and stays sharper than standard heavy-duty blades. This knife features a patented interlocking nose to hold the blade securely. The three-position, retractable blade can be stored in the handle. This knife includes three blades and comes with Stanley's limited lifetime warranty.
Everyone knows the importance of the right tool for the job. Stanley's 'Application Specific Blades' are designed with unique features for cutting drywall, roofing shingles and paper. Each blade is constructed of carbon alloy steel. With Stanley's patented S3 Technology, paper blades start sharper and stay sharper, roofing blades are stronger, and drywall and paper blades deliver more cuts per blade. The entire line provides better performance than standard heavy duty blades. View the comparison chart to choose the Stanley blade that is right for you.
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Buyer Reviews
Average Buyer Rating:

Customer Rating: 
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Why buy anything else?
There is nothing like a good tool that does its job everytime. Other knives may look cooler or feel squishier, but the Stanley 10-099 Utility Knife will always be as near to perfection as may be found. Solidly built and utilizing an ingenious mechanism for replacing and storing blades (a simple screw to hold its two halves together), this knife is utility par excellence.
Look no further, unless you like squishy grips and well thought-out color schemes. Did I mention the unmistakable positive feeling of the blade-locking mechanism?
Customer Rating: 
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This knife is inexpensive and reliably good!
I have owned this knife for over 10 years and though it is scratched from rough rides in several toolboxes, it still works like new. Although this knife does not have a fancy 'ergonomic' grip or flashy color scheme going for it, what it does do is perform reliably well for a long long time, and not cost you much up front! I agree with the previous reviewers - some of the best features of this knife are the ability to store up to five blades inside the knife body, and the ability to expose the blade at several different settings.
Now that I have set up a woodworking shop in my garage, the handy hole in the end of this knife makes it easy to hang on a pegboard hook. If you need a real workhorse of a utility knife, I cannot recommend a better one than this!
Customer Rating: 
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As Good As They Cut
When I was in 8th grade in technology class, this was the prized utility cutters among the class. Unlike other utility cutters we had this was lightweight so using it repetively was less a burden and practically unbreakable (I should know because I accidently broke some of the others after repetitive collisions to the hard floor)no matter how many accidents or kids just trying to break it for fun. As for its cutting ability, this blade so sharp and sturdy that along with normal cutting of boxes we have cut thick rubber, half inch dowels, and the dare devils even cut some thick copper wiring with this knife without the blade breaking like the other utility knives we had. So over all this thing is cheap, light, sharp as ... and simply just the best regular utility knife out there.
Customer Rating: 
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The Old Standby for Many Applications
I have one of these that is probably 10 years old; I'd have older ones if I hadn't lost them. I might still have them if they were as bright as my other yellow plastic one. Yes, you need a screwdriver (or a dime) to change blades, but you can store about 5 fresh ones inside the handle, real handy if you can't get back to your supply easily. This model will let you set the blade at several different positions so you don't need to expose the whole blade.