... Zinc plated rollersRoller diameter can be 25mm, 38mm, 50mm, 60mm, 76mm, 89mm,Free steel roller,Tapered steel roller,Grooved steel roller,Sprocket steel roller,Drive taper steel ... roller,Accumulating steel ... 550-1500PVC,Coat rubber,Carbon steel ,Stainless steel , Aluminium alloy galvanizedchrome plateskin ...