... speed steel is 63-66HRC. It is specially suitable for cut art paper, copy paper, metal laminated paper, card board ... the main products as follows:1. printing industry: we supply blades for many paper guillotine cutters, such as polar, Whlenbberg, Perfecta ... slitter, dish slitter, folding blades, etc.4. others: ice resurfacing knives, die cutting knives, blades for bending machine, mould cutting knives ...