1.Caster Size:2"/3"/4"/5"/6"/8" 2.Wheel Material:TPR/PP/PU/Rubber/Nylon ... Plate,Threaded stem,Grip stem,bolt holeCustomized availabe2"/3"/4"/5"/6"/8"TPR / PP / PU / Rubber / NylonZinc plated, Chrome platedBall ... 2. Rotary Flexibility3. Quiet while sliding4. Floor protection resistance5. Anti-friction, good impact resistance, high load bearing. 6. Material: High quality ...