【Upgrade Materials and Processes】- Thickened universal steel column, thickening plate and double support bearing. High-strength stainless steel electrophoresis bracket, wear-resistant mute steel ball. The casters are made of premium polyurethane material with strong abrasion resistance, silent shock absorber, wear-resistant, no drag marks. And improve the shock resistance of the entire caster. Free screws and wrench from now on. Total load capacity: 2000 lbs. 【With Locking Brake】3 inch casters. It comes in a pack of 4 wheels, each wheel has a separate brake. The brake locks the wheel and the swivel at the same time, which is effective in stopping and preventing the devices from moving and hurting others. 【360 Degree Rotating Top Plate】-Easy to transform in any direction you want and spend little force to move on. Note that the 3-inch casters are not small. 【Detailed dimensions are shown in Figure 2】 【Save Strength and Widely Used】- Easy to move the table, seat or shelf or other things