Roller Chain 1.Quality standard:ISO9001 certificate 2.Material:steel,20Mn2, Q235, Alloy 3.Modle:simplex,duplex,triplex Roller Chain1).Quality standard:ISO9001 certificate2).Materialsteel,20Mn2, Q235, Alloy3).Modle:simplex,duplex,triplex and so on4).Long service life5).Big Pitch , 20A (100) - 48A ( 240), 20B-72B6).Excellent and high quality control,advanced producing equipment .We are the ...