Feature:1. Mute Rubber: The wheels are made of high quality mute rubber materials, which have high mechanical strength, shock absorption, wear resistance, and no damage to the floor.2. Stainless Steel Bracket: The bracket of this universal wheel is made of high quality stainless steel, which can prevent corrosion and rust.3. Double Ball Bearing: The accuracy double ball bearing with supporting steel sleeve is embedded to make the wheel rolling silently and smoothly.4. Application: Casters for equipment and furniture, including footstools, coffee tables, plant shelves, bookshelves, shoe cabinets, toy boxes, shopping carts, work tables, bed storage, etc.5. Flexible and Safe: Flexible and safe universal casters make possible to rotate with the equipment, which is conducive to transportation.Specification:Item Type: Swivel Rubber Caster WheelsMaterial: Stainless SteelWheel Material: RubberWheel Diameter: Approx. 50mm / 2.00inInstallation Aperture: Approx. 6mm / 0.23inDistance from Hole Center to Hole Center: Approx. 35mm x 45mm / 1.38in x 1.77inWheel Width: Approx. 21mm / 0.82inBoard Size: Approx. 46mm x 58mm / 1.81in x 2.28inQuantity: 4PcsUse Scenarios: Airports, Hotels, Warehouses, Trolleys.Package List:4 x Swivel Caster