When a project calls for moving real weight, this set of four 5-inch swivel casters is rated for 450 lbs per wheel, or 1800 lbs total across the set. Dual ball bearings keep the ride smooth under load, and the A/B brake locks the wheel and swivel from both sides so a heavily loaded cart, workbench, or machine base won't creep once it's parked. The PVC tread is non-marking, so it won't leave scuff trails on finished concrete or wood shop floors, and the reinforced steel bracket and thickened plate are built to carry industrial loads without bending. At 6.10 x 2.51 x 6.10 inches and 9.17 lbs each, these are sized for larger equipment stands, dense storage racks, and workbenches rather than light furniture, and the set ships with the mounting hardware needed to bolt them onto a 4.5 x 4-inch plate pattern.