【Product Specifications】 Quantity: Pack of 2; Overall Height: 10 inches; Wheel Diameter: 2 inches; Mounting Hole Spacing: 2.95 inches (length) x 1.77 inches (width); Retractable Length: 2.55 inches; Bolt Hole Size: 8.9mm (compatible with M8 screws); Wheel Load Capacity: 100 kg (220 lbs); Spring Load Capacity: 50 kg (110 lbs); Maximum Load Capacity per Caster: 50 kg (110 lbs). 【Built to Last】 Crafted from premium TPU (Thermoplastic Polyurethane) material, with a remarkable spring load capacity of 110 lbs and resistance to corrosion, this gate caster is designed to withstand the test of time. Enjoy smooth movement and gate operation with its shock absorption feature. Ensuring silent, sturdy, and long-lasting performance. 【User-Friendly Installation】 Our spring-loaded gate caster comes equipped with a heavy-duty universal mounting plate, featuring four holes for convenient connection to wooden gates or tubular agricultural gate rails (screws not included). 【Enhanced Spring-Loaded Design】 Our gate caster features a hidden spring design which could automatically adjust the height according to the distance to ground, your gate will open and close effortlessly, even on uneven terrain. Extending the spring's lifespan while bestowing your gate with a streamlined and polished aesthetic. 【Mounting Plate】 The robust universal mounting plate of our farm gate wheel comes equipped with four pre-drilled holes, facilitating easy attachment to wooden gates or secure fastening along both the horizontal and vertical rails of tubular farm gates.