Swivel Caster with 3" x 1-1/4" Cast Iron Wheel with Plain Bore Bearing - 200 lb. Capacity - Overall Height: 4-1/4" - Mtg. Plate Size: 2-1/2" x 3-5/8" - Bolt Hole Centers: 1-3/4" x 2-13/16" to 1-3/4" x 3-1/16" - Attaching Bolt Size: 5/16"