Rigid Caster with 4" x 1-1/4" Polyurethane on Polypropylene Wheel with Precision Ball Bearing - 250 lb. Capacity - 5-1/8" Overall Height - Mounting Plate Size: 2-5/8" x 3-3/4" - Bolt Hole Centers: 1-3/4" x 2-7/8" to 3"