Shock Absorbtion: The gate wheel is easy to move and roll, make opening and closing gate easy. 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 440lbs and can also withstand exposure to chemicals and solvents. Heavy Mounting Plate: Heavy duty universal mounting plate with 6 holes to easily attach to wooden gates or along horizontal or vertical rails of a tubular farm gate. Premium Quality: Made of nylon material and metal construction, sturdy and durable. Specification: color: as the picture shown Material: Nylon and Metal Weight: Approx.1498g or 52.8oz Caster Dia.: 100mm or 4in Load capacity: Max.200kg or 440lbs Package List: 1 x Gate Wheel Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.