Shepherd Hardware 4-Inch Swivel Plate Soft Rubber Caster, 225-lb Load CapacityThe Shepherd Hardware 4 inch soft rubber swivel plate casters give mobility to heavy loads on smooth, hard surfaces and finished concrete floors where quiet movement and floor protection are major considerations. 4 inch diameter black soft rubber wheel with ball bearing swivel and plate mount 4 1 8 inch x 5 inch plate 225 lb load capacity Soft rubber wheels for quiet operation over smooth, hard surfaces A great choice when quiet mobility and floor