• Set of 4 heavy-duty solid steel wheels, extremely durable. • Each 2-inch wheel supports 150 pounds, total 600 pounds for 4 wheels. • 360-degree swivel wheels for smooth maneuvering and transport of heavy objects. • Superior quality materials: industrial electrophoresis brackets, precision ball bearings, polyurethane wheels. • Does not damage the floor, flexible movement, no floor marks. • Wheels with parking brake, double lock, and double ball bearing for maximum stability. • Wide use: industrial rollers for indoor and outdoor, carts, furniture, wire shelves, storage racks, workbenches, toolboxes. • Includes spring washers, lock nuts, and mini wrench for easy installation. • Color: black. • Material: PVC + metal. • Note: color differences possible due to light and screen, measurement error allowed of +/- 1-3 cm.