4X Swivel Casters, Furniture Casters, Wheels with Brakes, L-Shaped Mounting Plate 25mm for Furniture, Planters, Cribs Heavy Duty and Durable - Each caster has a load capacity of 57 kg; our gate casters are designed to support the weight of wide metal and wooden gates and garage doors weighing up to 57 kg Great for use on uneven surfaces - the casters are mounted on springs, which allow the height of the wheels to automatically adjust as the wheels roll over uneven ground, keeping the door at an even height 360 Degree Swivel - With a 360 degree swivel design, it can be used for left or right-handed doors; it allows the caster to move and swivel in any direction and can be moved and swivel on unstable terrain Easy to Install - It comes with 2 pre-drilled fixing holes so you can attach it to the door quickly and easily Dimensions - 101 mm rubber wheel, 145 mm stem, 94 mm fixed spring part, 51 mm absorb movement Heavy Duty and Durable - Each castor has a load capacity of 57 kg; our gate castors are designed to support the weight of wide metal and wooden gates and garage doors weighing up to 57 kg Ideal for use on uneven surfaces - the castors are mounted on springs which automatically adjust the height of the wheel as it rolls over uneven ground, keeping the gate at an even height