Challenge 42TCM High Speed Steel Replacement Blade This high quality Diamond Cut replacement cutting blade is designed to provide superior cutting performance and extended cutting life. Our razor sharp replacement paper cutter blades are manufactured to precise OEM specifications and will outperform similar blades from other manufacturers. It is always a good ideal to have an extra blade or knife on hand when you send your other blade out for sharpening or in case you need to replace a blade that has been repeatedly sharpened or has become nicked. This knife has a bi-metallic composition consisting of one part 18% T1 German Tungsten High Speed Steel and one part standard grade steel. A special fusion process bonds these two grades of steel together to produce an extremely wear resistant knife.
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