4 Inch Total Lock Caster - Rubber Wheel - 1/2"-13 x 1-1/2" Threaded Stem Service Caster Brand 4" x 1.25" Thermoplastic Rubber Wheel 190 pounds per caster Screw in or use nut to secure Threaded Bolt Dimensions: 1/2" - 13 x 1-1/2" Mounting Height: 5-1/8"