... 2) Mirror polish 3) Lost wax process 4) Standard:ASTM Lock catch of investment castingSpecification1, investment casting ,precision casting2, carbon steel ... / alloy steel /stainless steel3, SDM/OEM4, FIMA , AP,QP,QA,QC,AOL,RDThe ultimate success of casting design deponds on ... steel4) Tool steels costs vary widly depending on grade. lock catch of investment casting OEM of china jygcasting