Heavy-Duty Build: Bearing Trolley Assembly Made with Hot-Rolled Carbon Steel of solid steel for impact resistance. Galvanized to rust resistance of wheeled . and noiseless during use, bearings and pins are firmly welded, work stably, Resulting In Strength and Quality Operate Steadily: Wheel Trolley Standard deep groove ball bearing installation, is very no noise to it when used.Bearing welding positioning, to the stability of the work. Unique design: The bolt is in the fastening groove, trolley will not be blocked in the channel. 4 Wheel Heavy Duty Trolley Assembly With Silent Wheel Easy Operation: When using, just push the wheel into the pillar channel, you can use the cart . Style: A- wheels with rings Color: Silver Material: steel Package Contents: 2 x Silent Trolley Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.