PLATE SIZE: 2.5" (63mm) x 3.5" (90mm). Hole center to hole center: 1.7" (44mm) x 2.8" (72mm). WHEEL DIMENSIONS: Caster Wheel Width: 1.2" (30mm). Caster Wheel Diameter: 4" (102mm). Caster Wheel Capacity: 400lbs each metal caster. Caster Wheel Material: Iron. Overall Heights : 4.9" (125mm). SIDE LOCK BRAKE: 2 wheel has brake can stop the wheel moving. Side lock is effective to prevent the device from moving, ensuring the safety of people and goods at any time and at any angle. The heavy duty steel casters contains two ball bearings, which can rotate freely and is shock resistant. 360 DEGREE ROTATE SWIVEL CASTERS: Transform the mating equipment to any directions in the most efficient and labor-saving way, our cast iron caster wheels are the best accessories for the heavy furniture, desktop, table, cabinet or trolley. HEAVY DUTY CONSTRUCTION: The support frame and top plate casters wheels are made of high quality iron with roller bearing for each wheel, moving smooth, the load capacity for each casters is 400lbs, and it’s up to 1,600 lbs. WIDELY USED: Heavy duty cast iron caster wheels can be used in both as industrial caster and residential applications, for coffee table, plant stands, bookshelves, shoe bins, toy bins, shopping carts, workbench, warehouse or supermarket shelves, they can be installed to most devices if you want.