use for mine or auto aparts. our main supporting customer is :HILTI OneStep self-drilling rock bolt system 1.ISO9001:2008 and TS16949 Approved 2.OEM service available 3.Materials: stainless steel,cast iron,pig iron,carbon steel,alloy steel,non-ferrous,grey iron,ductile cast iron and so on 4.Process: lost wax process, soluble glass process , silicon process casting5.Application: Industrial parts, ...