Usage Tips:[STURDY CONSTRUCTION] The heavy duty gate wheel made from hard tire grade rubber and solid steel plate with superior black powder coat finish & zinc plated, wear resistance, corrosion resistance, rust-proof for long lasting outdoor use. Strong load bearing support for each gate caster, easy to open or close large, heavy gates. [ONLY for ROUND PIPE] The 6 inch hard rubber gate support wheel comes with adjustable Steel U-Bolt for mounting, fits 1-5/8 inches through 2 inches round fence pipe, Lift your Gate Up to 8-1/4inch. Prevent Gate from Dragging. Please check your gate frame diameter before buying. [EASY INSTALLATION] Come with all mounting hardware for quick installation, Just attach the wheel on the bottom rail of the gate and adjust the angle to make sure the wheel touch the ground, Tighten U-bolt nuts securely until helper gate wheel couldn't slip around the pipe. [SUPPORT WEIGHT UP TO 500LBS] durable gate helper wheel can easily hold up 500lbs, preventing the gate from sagging and saving gate hinges, perfect for chain link fence gate, ranch gate, cattle fence, farm pipe gates, pool gate, metal gate, swing gate, garden, yard, patio, driveway, moving smoothly on grass, gravel ground and concrete. Colour:Black Material:Metal+Rubber Package Contents: 1 * gate wheels for metal tube gate Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.