Feature:1. Spring loaded designs make gates to open and close freely by automatically adjusting height on uneven ground while eliminating gate sag2. The product is a heavy duty caster, the wheel has a maximum load capacity of 90kg3. This spring caster can also withstand exposure to chemicals and solvents, very durable4. Made of premium rubber material and high quality metal construction, sturdy and durable5. Heavy duty universal mounting plate with 2 holes to easily attach to wooden gates or along horizontal or vertical rails of a tubular farm gate, easy to installSpecification: Item Type: Gate WheelMaterial: Aluminum, rubberPurpose: Multifunctional casters, shock absorptionLoad Bearing: 90 kg / 198.4 lb(approx.)Caster Size: Approx. 12.7cm / 5inSize: Approx. 310mm / 12.2in130mm / 5.1in125mm / 4.9in220mm / 8.7in250mm / 9.8in280mm / 11inM8 x approx. 95mm / 3.7inThread Length: Approx. 52mm / 2in.Package List:1 x Caster1 x Damping Device3 x Screw3 x Nut3 x Gasket