Heavy Duty Construction: Bearing trestle assembly made of solid steel hot rolled carbon steel for impact resistance. Galvanized for rust resistance of the wheels. and quiet during use, bearings and pins are properly welded, working stably, resulting in strength and quality Working Steadily: Wheel cart Standard deep groove ball bearing installation, it is very quiet in use. Bearing position welding, for work stability. Unique Design: The bolt is hidden in the mounting slot, the cart will not be locked in the channel. 4 Wheel Heavy Duty Trolley Set with Silent Wheel Easy to Use: When in use, just push the wheel into the channel of the column, you can use the cart. Style: Wheel A with rings Colour: Silver Material: steel Package Contents: 2 x Silent Cart 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 +/- 1-3 cm.