... ,large production, large stock Sprocket 1, all made by advanced CNC lathe, pass ISO, ANSI,DIN quality certification. high precision and good ... MaterialC45, A3, 40Cr, 20CrMnTi, 42CrMo, copper, stainless steel and so on as per your requestprocessForged or castingHeat treatmentHigh frequency quenching, heat ... plastic bag and outer carton box or customer requirement. weld on sprocket