Casters are included in our line of restoration hardware. Offered in several different styles and sizes to meet most needs. 3" x 13/16" swivel stem caster, black soft rubber wheel, Delrin wheel bearing, rivet axle, 100 lbs. load rating, 3 - 9/16" overall height, zinc finish, 3/8 - 16 x 1" threaded stem, pinch type brake. They are recommended for 75# load usage.