... roller chain,1)material:40mn2)color : nature,black,blue,yellow3)advanced heat treatment process, mesh belt conveyor ... packing as your requirementMain products as the following1)roller chains: A series(12.7-63.5mm pitches ... ,420H,428,428H,520,520H,6303)short pitch conveyor roller chain attachments:A-1,A-2.K-1 ... SK-A,SK-24)double pitch transmissions v& conveyor chains :2040,2042,2050,2052,2060,2062,2080 ...