Construction This twin-wheel caster is designed to support the increased weight of adjustable beds. The steel stem with brass friction ring is approximately 7/16" in diameter and is 1 1/2" high. Twin 50 mm (1 7/8") diameter wheels provide stable secure support and easy mobility for the bed while protecting floors and carpet by distributing bed weight over the maximum surface area. The included brake mechanism is easily engaged or released with a gentle touch of the toe. Application These casters are suitable for replacing damaged or worn out casters, changing from glides to casters, or new bed construction. For any application, please carefully measure the installation site to insure that the 7/16" x 1 1/2" caster stem will fit. Color Black How Sold Sold as a Set of 4.