Feature: 1. Spring loaded designs allow gates to open and close freely by automatically adjusting height on uneven ground while eliminating gate sag 2. The product is a heavy duty caster, the wheel has a maximum load capacity of 75kg 3. Spring caster can also withstand exposure to chemicals and solvents, very durable 4. This gate wheel is made of premium rubber material and high quality metal construction, sturdy and durable 5. Easy to install, 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 Specification: Item Type: Gate Wheel Material: Aluminum, rubber Purpose: Multifunctional casters, shock absorption Weight: 75 kg / 165.3 lb(approx.) Caster Size: Approx. 10.2cm / 4inSize: Approx. 280mm / 11in 110mm / 4.3in 100mm / 3.9in 190mm / 7.5in 220mm / 8.7in 250mm / 9.8in M8 x approx. 95mm / 3.7in Thread Length: Approx. 52mm / 2in. Package List: 1 x Caster1 x Damping Device3 x Screw3 x Nut3 x Gasket