roller,door roller, window roller,pulley,plastic bearing size:10-100mm steel and plastic roller,door roller, window roller,pulley,plastic bearingsize:10-100mmsteel and plasticroller feature:Diameter of plastic is 23.85mmHeight of plastic is 10.22mmLength of axle is 62mmDiameter of axle is 6.07mmThe axle with screw thread sliding door roller,window roller,