Shepherd Hardware 9673 2-Inch Office Chair Caster, Twin Wheel, 3/8-Inch Stem Diameter, 75-lb Load Capacity 2-inch diameter twin wheel black plastic swivel caster with grip ring stem mount 3/8-inch x 1-inch grip ring stem with 2-1/4-inch clearance height 75-lb load capacity per caster Twin wheels allow for more surface area in contact with the floor and move in opposite directions to minimize carpet fiber twisting - commonly found on RTA furniture, office chairs and entertainment centers Includes 1 caster