This 4 in. heavy-duty casters set is crafted to industrial-grade standards while also taking into account the quietness requirements of home use. The entire (set of 4) wheels has a static load capacity of 2,200 lbs. Each wheel body is made of high-elasticity PU material, which does not damage wooden floors, tiles or carpets. It is silent when pushed and pulled and leaves no scratches. The 360° ball bearing rotating structure enables flexible U-turns even in narrow Spaces. Independent dual-pedal brakes, lock immediately upon pressing, as stable as a mountain. 16 sets of stainless steel bolts, anti-loosening nuts and labor-saving wrenches are included as a gift. Installation can be completed in ten minutes without the need for additional tools. Whether it's unloading materials from the workbench, moving sofas, upgrading coffee tables, installing storage boxes under beds, or moving flower stands and tool cabinets, all can be equipped at once. It won't collapse or get stuck even after long-term use.