... :3"/4"/5"/6" 2.Wheel Material:TPR/PP/PU/Rubber 3.Plate Surface: zinc plated. 4.Stable quality with good ... ,bolt holeCustomized availabe2"/3"/4"/5"/6"TPR / PP / PU / Rubber / NylonZinc plated, Chrome platedBall bearing , double ball bearing , bushing , delrin ... impact resistance, high load bearing. 6. Material: High quality cold-rolled steel plate.7. Applied to furniture as chair, sofa; Medical ...