"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, Foot Brake No, Material Type Steel, Wheel Type Polyolefin, Caster Type Rigid, Finish Type Zinc plated, Wheel Width in. 1 1/4, Bearing Type Plain, Wheel Diameter in. 3, Casters qty. 1. Zinc electrogalvanized finish for bright look and rust prevention Rugged polyolefin wheel Riveted king pin 150 lb. capacity"