Features: Sturdy PVC Casters: The stem casters are made of super rust-proof, wear-resistant, rubberized material that slides noiselessly and does not produce scratches to damage the floor when walking on it. 360 Swivel and Locking Brake: The casters are made of precision ball bearings, flexible and smooth can be 360 flexible swivel, smooth and stable, safe and labor-saving, allowing you to change direction at any time, the locking brake can help the casters to stop instantly at any time needed, the casters are both convenient and safe to use. Superior Weighing Performance: The strong use of double bearings, polyurethane, strong load-bearing capacity, so you can use it with more peace of mind. Multiple Scenario Applications: Rollers are ideal for small equipment and furniture, dining tables, folding tables, mobile carts, workbenches, planters, toolboxes and more. Complete set of Casters: For your convenience, we put 4 casters in one set, delivered with iron pads, screws with small wrench, which makes you more convenient to use. Specifications: Material: Polyurethane, Metal Color: Transparent Caster diameter: 50 mm (2 inches) Caster width: 20.5 mm (0.8 in.) Screw Diameter: 8 mm Screw length: 15 mm Mounting height: 67 mm Package Included: 4 x Swivel casters, spacers 4 x Nuts 1 x Small wrench Note: The size is measured manually, there may be such as error, please refer to the actual product.