Rigid Caster with 12" x 3" Phenolic Wheel with Roller Bearing - 3,500 lb. Capacity - Overall Height: 15-1/2" - Plate Size: 5-1/4" x 7-1/4" - Bolt Hole Centers: 3-3/8" x 5-1/4" to 4-1/8" x 6-1/8" - Attaching Bolt Size: 1/2" Made in the USA