Shepherd Hardware 9782 4-Inch Cast Iron Swivel Plate Caster, 500-lb Load Capacity 1-1/4-inch wide x 4-inch diameter cast iron silver wheel with heavy duty ball bearing swivel plate mount 4-inch x 5-inch top plate with 5-inch clearance height 500-Lb load capacity per caster Cast iron casters have an exceptionally long wear life and can withstand extreme temperatures. Recommended for infrequently moved objects on rough wood or concrete floors. Includes 1 caster