"Fairbanks Polyolefin Rigid Caster is constructed of cold-forged steel with steel ball bearings. Bolt Hole Spacing 2 7/8 x 1 3/4, Overall Height in. 4 3/16, Mount Height in. 4 3/16, Capacity lbs. 150, Material Type Steel, Caster Type Rigid, Wheel Type Polyolefin, Wheel Width in. 1 1/4, Finish Type Zinc plated, Bearing Type Plain, Foot Brake No, Casters qty. 1, Wheel Diameter in. 3. Zinc electrogalvanized finish for bright look and rust prevention Rugged polyolefin wheel Riveted king pin 150 lb. capacity"