Features:Spring loaded design: allow gates to open and close freely by automatically adjusting height on uneven ground while eliminating gate sag. Heavy duty caster: the wheel has a maximum load capacity of 220lbs and can also withstand exposure to chemicals and solvents. Shock absorbtion: easy to move and roll, make opening and closing gate easy. Made of premium rubber material and metal construction, sturdy and durable. Heavy duty universal mounting plate with 4 holes to easily attach to wooden gates or along horizontal or vertical rails of a tubular farm gate. Specification:Material: Rubber + MetalWeight: Approx.1034g 36.5ozCaster Dia.: 100mm 4inLoad capacity: Max.100kg 220lbsPackage List:1 * Gate WheelNote:Please allow slight error due to manual measurement. Thanks for your understanding.