Adam Hall 3703 Swivel Castor 50mm, 50 mm Swivel Caster, Frame and mounting plate made of 2 mm galvanized steel, Gray rubber swivel caster on bolted hub, Height: 72 mm, Working load: 120 kg per set (4 casters), Base plate: 50 x 50 mm, Hole distance: 35 x 35 mm, With breaks