FEATURES: Easy-rolling 2inch (50mm) diameter Black PU wheel, 77lbs Capacity per Caster. SIZE: Mounting Stem: Push-in type - 11x22mm (7/16’x7/8’); Mounting Height: 56mm / 2.24inch EASILY INSTALL: Simply pull your old casters out, then push the new wheels in, universally fit for various seats. FLOOR PROTECTION: High Quality PU caster, Get smooth rolling all while protecting your floors. Widely Used: Perfect casters for work benches, instrument cases, art tables, coffee table, plant stands, bookshelves, shoe bins, shopping carts and so much more.