1.Size – Wheel diameter: 56 mm / 2.2 inches; Overall height: 70 mm / 2.76 inches; Groove width: 20 mm / 0.79 inches; Hole diameter: 7 mm / 0.28 inches; Mounting length: 90 mm / 3.54 inches; Mounting width: 40 mm / 1.57 inches; Hole spacing size: 28 x 77 mm (L x W); Capacity per wheel: 300 kg. 2.Material – Made of galvanized carbon steel, these great strength and loadbearing capacity and ensure durability, high hardness, and wear resistance. Rolling gate wheels are designed to handle heavy loads up to 300 kg / 661 lbs. 3.Features – The sliding gates are designed to enable smooth and effortless rolling movement, allowing the wheel to run along a rail, ensuring stability and reducing friction from corrosion and material, making them suitable for outdoor applications. 4.Applications – The pulley bearing can be used for various types of sliding gates and mechanical drive devices, including industrial gates, commercial gates, and residential gates, sliding gates for barns, automatic mobile doors, aluminum doors, pulleys and drawers, wheelbarrows and garden carts, etc.