... 2.Delrin,steel,stainless steel,alluminum,bronze 3.Casting steel double spur gear 4.heavy gear rim ... BS , DIN , JIS , NF ProcessInvestment casting , die casting , gravity casting , sand casting MachiningTurning , milling , drilling , grinding , threading , CNC machining, etc. FinishingSand blasting , polishing , ... testing. CertificateISO9001:2000 Main productsCNC Machining Parts , Investment Castings