[CASTER SIZE]: Wheel diameter: 4", width: 1.25". Top plate size: 3-5/8" x 2-3/8"; Hole spacing: 2-3/4" x 1-3/4". Total height of caster: 5-1/8". [HIGH QUALITY MATERIAL]: The 4-inch thermoplastic rubber wheels are bonded with an extremely high-quality non-marking gray thermoplastic engineered rubber tread. These wheels are softer than the standard urethane wheels you'd normally use. These are designed to roll over debris, gaps, cracks, and obstacles with ease. Can be used in many applications such as food service, hospitals, laboratories, and many institutional applications and industries. [SMOOTH & NON-MARKING]: High-quality double-precision bearings are selected to extend the service life of the bearings. Made of plastic rubber material, these casters are non-marking, quiet, shock-absorbing, and vibration-absorbing, and can effectively protect equipment and floors as well as many floor surfaces. [WIDELY USED HEAVY DUTY CASTERS]: 400 lbs load per caster. The total load on all four wheels is 1600 lbs. Heavy-duty casters can be used in industrial and residential applications such as carts, cabinets, bookshelves, shopping carts, display exhibit equipment, carts, mobile workstations, furniture, and more. [Quality Assurane]: If you encounter any quality issues, please don't hesitate to contact us, and we will respond within 24 hours and send you the new replacements. If for any reason you're not satisfied with your purchase, we will also offer a 60-day money-back guarantee. ZDNEY 4 Inch Caster Wheels, Rubber Wheels Silent Castor- Set of 4 Heavy Duty Caster Wheels with Brake 1600Lbs, Industrial Plate Casters Wheels for Cart Furniture Workbench (4 Side Brake)