Premium Quality: Casters are made of solid Hard Rubber which yields a high shock load, impact resistant, and abrasion resistant wheel. These wheels are lightweight yet hold high weight capacities and enhance the impact resistance of the whole caster. Top Plate Caster Dimensions: Length: 3-5/8", Width: 2-1/2". Hole Spacing: 2-3/4" x 1-3/4". Rubber wheel size: 4" X 1.25". Overall height of casters: 5-2/5". The Heavy duty industrial caster set of 4 are easy to install, so they won't take up too much of your time. Smooth & Durable: Hard rubber caster Wheels are washable, impervious to water, and highly resistant to solvents, oils, grease, most chemicals, and cleaning solutions. These wheels do not flat spot over time like softer tread wheels. No-marking rubber casters. Widely Used: Commonly used in both industrial and residential applications such as workbenches, instrument cases, toolbox, trolleys, furniture, carts, dolly, workbench, trolley, suitable for indoor and outdoor, it is a mobile expert. Saving labor and time. Casters Include: Plate Casters set includes 12 Swivel caster. Each Caster wheels for furniture has a weight-bearing capacity of 300 lbs. NINOSO 4" Caster Wheels, Heavy Duty Industrial Swivel Casters, Plate Hard Rubber Wheel for Cart Furniture Workbench (12 Swivel)