Durable Materials:The 8-inch heavy-duty gate wheel constructed from automotive tire-grade rubber and solid steel plates. The durable rubber wheel is designed to minimize slipping, reduce wear, and handle high temperatures. The galvanized surface offers protection against corrosion and rust, providing superior durability and stability Suitable for Round Tube: The 8 inch rubber gate support wheel comes with adjustable Steel U-Bolt for mounting and fits 1-3/8" through 2" round fence tube gates. The U-bolt has a length of 4 inches. The design of the grip teeth makes them very useful.NOTE: Check your gate frame diameter first Heavy Duty: Load Capacity - 660 lbs. Its large size and sturdy support allow gates to open and close freely ,effectively stopping the gate from sagging, drag on the ground and keeping the gate balanced. Ideal for chain-link fence gates, ranch gates, cattle fences, farm pipe gates, pool gates, and metal gates Easy Install: First, raise the support gate a few inches, then put the rut runner under the gate. Next, use the U-bolts to secure the rut runner to the gate. Be cautious not to overtighten. Lastly, utilize the adjustable bolts on either side of the gate to ensure it rolls straight and aligns with the latch Customer Care:Two Years. If there are any problems, let us know, and our team will help you.We will reply within 24 hours 1 PACK