1.hanging wheel / HW-3002 2.suitable for wood door , A-plastic door , A-alloy door , steel door 3.material : nylon+zinc alloy 1.hanging wheel / HW-30022.suitable for wood door , A-plastic door , A-alloy door , steel door castor made of nylon with precison ball bearing shelf made of zinc alloy clamp body made of zinc alloy 3.finish : cooper4.bearing door weight :100KG Guangzhou Qiwin Import&Export ...