Universal 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 Heavy Duty Material - The wheel swivel caster is made of premium rubber material and steel construction, sturdy and durable Rotating supports - Able to work equally well on level and uneven exterior surfaces such as asphalt, brick, concrete, dirt, grass, gravel and pavers Easy Mount - Versatile hole pattern also allows for easy mounting to a tubular farm gate along horizontal or vertical gate rails Provide Smooth Movement - Spring suspension smooth out uneven ground