4 Inch Heavy Duty Rubber Mute Spring Loaded Gate Door Wheel Caster Spring Wheel Home Gate Door RollerMaterial: Metal and rubber. 4 inch Gate Caster with Adjustable Spring Bracket is designed to allow gates to open and close freely. ;It features a 50-60kg load rating and a spring-loaded clamp that acts as a when the caster is rolling over rough or uneven surfaces. ;It also features a universal mount for wood or metal gates.Heavy Duty spring-loaded gate casters adjust with surrounding terrain to maintain gate height throughout the opening and closing cycles. ;These rotating supports work equally well on level and uneven exterior surfaces such as asphalt, brick, concrete, dirt, grass, gravel and pavers.Colour: BlackSize: 10cmDelivery Quantity: 1 Piece