... .42mm 27.5g 11.91mm 40mn Roller chains 1,chain material:40mn2,the roller chain quality have A,B,C three grade3,Original Equipment Manufacture ... kinds of motorcycle chains ,satandard or OEM are accepted Bitmap 1)Type :420,420H,428,428H,530,630 and so on2)Rivet ... customized We also produce another chains pls feel free to contact us if you have any questions short pitch 420 4sides rivet roller chain