... quality and reasonable price. 2.Smoothing running, unique design 3.Low noise design, good protection to the floors 4 ... .anti-friction, good impact resistance, high load bearing. 5.payment: after 30% T/T, advance delivery. 6.packing ... 75 65 90 30-60Configuration screw way M8-M12, 5/16-1/2. Stem way Diameter 8-11. ... the installation size of this series. economic 3"nylon pvc pp wheel for trolley caster