Shepherd Hardware 9674 2-Inch Office Chair Caster, Twin Wheel, 7/16-Inch Stem Diameter, 75-lb Load Capacity 2-inch diameter twin wheel black plastic swivel caster with grip ring stem mount 75-lb load capacity per caster; Includes 1 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 Stem Width (in.) .4375 	Wheel Diameter (in.) 2in 	Wheel Width (in.) 1.625in 	Product Depth (in.) 1.75 	Product Height (in.) 2.125 	Product Width (in.) 4.563 	Stem Length (in.) 1.5 	It attaches to furniture with a 7/16 in. x 1-7/16 in. friction-ring stem