2-1/4" Metal Ball Caster with Rubber Tread, Bright Chrome, with 3/8" x 1" Grip Ring Stem Capacity: 75 lbs Diameter: 2-1/4" Mounting: Grip Ring Stem - 3/8" diameter x 1" long Finish: Bright Chrome with Rubber Wheel Tread Bearing: Self Lubricating Acetyl Resin Bearing