... steel, hardening and tempering steel, tempered steel, cold and hard casting parts, forging pats, hard ally steel, aluminum alloy, bearing steel, carburized steel ... plastics, hard rubbers, aluminum, tin, copper, soft steel, synthetic resins, fricative materials, etc.Technical Specifications ... Rockwell Indenter, Diameter 1.5875mm Hard Alloy Steel Ball Indenter, Large Testing Table , Medium Testing ...