€¢ 2 1/8 inch Wide x 2 inch Diameter Black PP roller with foot brake and 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 with side brake for locking into place €¢ A great choice when bed mobility is necessary to aid in cleaning or for easy room rearrangement >> The Shepherd Hardware 2-1/8 inch Black Bed roller with stem mount includes plastic socket and is ideal for wood or metal bed frames. mount includes plastic socket."