Shepherd Hardware 9733 2-Inch Office Chair Caster， Twin Wheel， 5/16-Inch Threaded Stem Diameter， 75-lb Load Capacity<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>2-inch diameter twin wheel black plastic swivel caster with threaded stem mount</li><li>5/16-inch x 1-inch stem with 2-1/2-inch or more adjustable clearance height</li><li>75-lb load capacity per caster</li><li>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</li><li>Includes 1 caster</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41aYyNOUb8L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51i6GwPOzBL.jpg" noproxy>