... type 2,high precision cnc tech 3,black oxide anti-corrosion 4,large production, large stock Black Oxide Sprocket 1, ... , galvanization, chroming and colored drawing. 3, material is A3\C45, stainless steel and customer requirement. and with the processing of ... plastic bag and outer carton box or customer requirement. ANSI C45 industrial machining hard teeth transmission chain drive black oxide sprocket ...