Designed to make opening and closing gates easier, the Albion 02RN04041S007 4" diameter x 1" wide rubber wheel gate swivel caster features a side mount 2-1/4" on center (3/8" mounting bolt holes) gate mounts and a spring loaded design to absorb shock from debris or rougher flooring/terrain. Capacity of caster is 125 lbs. per caster and the overall height, including spring, is 10-1/2". Complete caster specifications and downloadable CAD model are provided below.