FOOTMASTER GDR-60F-BLK-U Urethane Wheel and Pad Ratcheting Leveling Caster， 550 lbs， Top Plate 2 7/8" x 2 7/8"， Bolt Holes 2 9/32" x 2 9/32"， Black<img src="http://ecx.images-amazon.com/images/I/51T1AoJ0H9L.jpg" noproxy>