... high speed steel paper cutting knives have high hardness, wear-resistance and long service life after excellent heat treatment and cold ... 63-66HRC. It is specially suitable for cut art paper, copy paper, metal laminated paper, card board, PVC, metal foils and rubber sheet, ... as follows:1. printing industry: we supply blades for many paper guillotine cutters, such as polar, Whlenbberg, Perfecta, Itoh, ...