The irwin bi-metal utility blade, multi-pack, features 100 blades constructed with a sharp steel edge and flexible backing to create a shatterproof blade that retains its cutting edge three times longer than traditional carbide blades. Amazon. Com 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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