Rigid Caster with 8" x 2" Cast Iron Wheel with Roller Bearing - 1,500 lb. Capacity - Overall Height: 10-1/8" - Plate Size: 4-1/2" x 6-1/4" - Bolt Hole Centers: 3-3/8" x 5-1/4" to 2-7/16" x 4-15/16" - Attaching Bolt Size: 1/2"