These solid chain link double wheel carriers are designed for commercial and industrial rolling gates. The solid tires are perfect for gates running on smooth, solid, surfaces such as asphalt or concrete. Wheel carriers are galvanized, include u-bolt(s), and are weldable for a more secure fit. Typically, one double wheel carrier is required per single chain link gate to support the 'leading edge' of the gate. Rear of sliding gate is usually placed on a track made from tubing and supported with rear wheels, bolted to the gate with rear wheel brackets to fit 1-5/8" or 2" chain link gate frames. Rolling gates usually do not have any sort of track embedded in the driveway. Instead, 'gate tracking' is accomplished with the gate track installed on adjacent fence line. Rolling gates are only one type of sliding chain link gates, perhaps the least expensive