Deluxe Duet twin wheel casters complement all types of office and home-office furniture. 2″ diameter dual wheels provide maximum mobility and smooth quiet rolling on light-duty to medium-duty applications. Use hard wheels on carpeting. Weight rating is 100 lb. per caster. Casters include 7/16″ x 7/8″ B stems and 3/8″ x 1″ K stems.