Editorial Product Review:Item Description:100 Pack, Bimetal Utility Blades, Patented Bimetal Technology Makes Blades Shatter Resistant & Keeps Blade Sharp 3 Times Longer, Also Includes A Dispenser That Easily Dispenses 1 Or Multiple Blades.
Amazon.com Item Description:The Irwin Blue Blade Bi-Metal Utility Blade uses bi-metal technology to create a blade with superior performance and shatter-resistant ruggedness. The spring steel body has superior flexibility to resist breakage under stress, and the high speed steel cutting edge resists dulling. This back includes 100 blades.
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Buyer Reviews
Average Buyer Rating:

Customer Rating: 
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Sharpest blade I have ever seen. Period.
Sharp, Strong, WOW. I needed some better quality blades for general purpose use. I saw these and thought I would try them. They are far better than anything else I have tried or used. Even better than the expensive individually wrapped razor blades.
They cut without effort. I just used one to slice some garden hose ends off for replacement, it cut through them without effort.
Don't waste any more of your time with cheaper blades, pay a few extra pennies a blade for these amazing blades.
It also takes a LOT of effort to damage or break off the tip on these blades. It's not impossible, but, you have to give it some serious effort, like scoring deep cuts into commercial VCT on many many tiles, can wear down or break a tip, but it's rare that your going to put that much pressure on one of these knife blades. I likely still change my blades more often than necessary, just to keep a really sharp blade in my knives, but I would say they do last quite a long time.
Customer Rating: 
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Best Knife Blades Ever!
Excellent - I use utility blades everyday on plastic, wood, glass, everything- these blades will even score metal- rips through 1/4" plastic with ease, although expensive- blades will outlast CRL or Stanley blades, even with heavy everyday useage!