€¢ 2-1/8 inch Wide x 2 inch Diameter white PP roller with Universal stem mount (2 Pack) €¢ 3/8 x 1-1/2 inch friction stem mount plus plastic sockets for use on most metal and wooden bed frames €¢ 125 lb Load capacity each €¢ Hard plastic wheels swivel and are wider to spread the weight of the load on carpet €¢ A great choice when bed mobility is necessary to aid in cleaning or for easy room rearrangement >> The Shepherd Hardware 2-1/8 inch White Bed roller with stem 2-1/8 inch White Bed roller with stem mount includes plastic socket and is ideal for wood or metal bed frames. mount includes plastic socket."