Stainless Steel Rigid Caster with 4" x 1-1/4" Polyurethane on Polypropylene Wheel with Plain Bore - 275 lb. Capacity - Overall Height: 5-1/8" - Plate Size: 2-1/2" x 3-5/8" - Bolt Hole Centers: 1-3/4" x 2-7/8" to 3" - Attaching Bolt Size: 5/16"