Rigid Caster with 3-1/2" x 1-1/4" Cast Iron Wheel with Plain Bore Bearing - 300 lb. Capacity - Overall Height: 4-5/8" - Mtg. Plate Size: 2-1/2" x 3-5/8" - Bolt Hole Centers: 1-3/4" x 2-7/8" to 1-3/4" x 3"