1.Caster Size:3"/4"/5"/6" 2.Wheel Material:TPR/PP/PU/Rubber 3.Plate ... stem,Grip stem,bolt holeCustomized availabe2"/3"/4"/5"/6"TPR / PP / PU / Rubber / NylonZinc plated, ... ball bearing , bushing , delrin bearing , plain bearingFeatures:1. Easy to use 2. Rotary Flexibility3. Quiet while ... , logistics hand trolley, trolley ,etcOur advantage/service:1. We are manufacturer.2. Good quality, favorable ...