Marking material Any metallic or non-metallic. (Not more than HRC60 hardness) Typical marking applications All types of industrial parts, auto parts, motorcycle parts, metal plate of the plate batch numbers, dates, trademark, product serial number, VIN number, and so on. Main supplies Needles (usually 1 1 year replaced, according to the frequency of use and the hardness of workpiece; in fact, customers may also on its own on the fine stone polished, which can greatly extend the actual period of needles.