... loading:1-15 ton 3.surface:injection and galvanize 4.types:fixed,swivel and with brake iron core polyurethane ... PU core turning wheels, polyurethane set brake wheel, polyurethane screw brake wheel, polyurethane scaffolding brake wheel.3 to 8 ... bronzeB. Installation1.Fixed type2.swivel type3.swivel with brake type4.screw type5.scaffold typeC. Wheel materialPP= polypropyleneYUPA= nylon modifiedPA=nylonPU ...