High performance ball bearings: made of PP / polyurethane and steel, quite strong and durable. 30kg (30kg) per caster, 2 inch (40mm) diameter spherical swivel casters. Soft and Quiet: The precision ball bearing in the movement of the old caster is pleasantly smooth. 2 inch furniture wheels protect hardwood, laminate, tile, slate and all other low pile rugs or other insensitive floors. Wide range of applications: These front casters with casters are ideal for small sofas, chairs, ottoman, bench, TV cabinet, microwave cart, plant stand, shoe rack, toy rack and other small ones furniture. Product description Specification: Color: Ball Caster with Gripping Ring Shank Size: 2 " " (50 mm) Main material: polyurethane / plastic, metal Shank Diameter: 5/16 " " x 1 1/2 " " (8mm x 38mm) Impeller Diameter: 2 " x 2 " / 50mm x 50mm ((D * T) Mounting height: 2.4 inch / 60 mm Weight Capacity (Single): Max 30kg / 66lb Total height (including long rod): 85 mm. Weight: 810g Package contents: 4 sets of