420 C quality chain: 1)OEM offered 2)material:40mn orA3 3) ... ,chain material:40mn2,the roller chain quality have A,B,C three grade3,Original Equipment Manufacture Industrial chain&Motorcycle chainWe are ... accepted Bitmap 1)Type :420,420H,428,428H,530,630 and so on2)Rivet:support 4sides or 2 sides 3)Colors ... to contact us if you have any questions short pitch420 C quality roller chain