1. Construction: The sturdy gate wheel is made of high-quality tire-grade solid rubber and hot-dipped galvanized finish steel, high corrosion resistance, rust-proof for long lasting use. Tire grade solid rubber is sturdy and wear-resistant, suitable for outdoor use. 2.Support Weight Up to 500LBS: Gate helper wheels have sturdy, heavy duty construction. Chain link gate wheel with a top load capacity up to 500 pounds, gate support wheels can easily lift your gate. Works good on farm gate, ranch gate, swing gate and your chain link fence gate. 3.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. Please check your gate frame pipe diameter first before your purchase. 4.Universal Gate Helper Wheel: With its smooth-rolling bushing and bearings, this gate wheel can easily roll over concrete, pasture, grass and hard pea gravel grounds. It makes it easy to open and close your gate. The gate can be lifted from 3' to 8-1/4' to prevent it from being dragged.