sliding door roller 1.Material:iron,nylon wheel 2.Finish:plated zinc,chrome plated 3.Thickness: ... .Name: window rollers, sliding window roller,window pulley,sliding door roller2.Material: iron, plastic,nylon3.Thickness: 1.0-1.24.Surface treatment ... .5mmwidth:32.2mmwheel Dia:32mm90g50pcs/box4boxes/ctn40*23*1520,000pcs iron sliding door roller (XF-R045)