Shepherd Hardware 9193 2-Inch Stem Caster with 7/16-Inch Stem Diameter, 80-lb Load Capacity Gives Mobility To Heavy Loads On Smooth Hard Surfaces & Finished Concrete Floors Where Quiet Movement & Floor Protection Are Major Considerations Not Safe For Use With Acid, Heat, Oil Or Water, Use On Carpets, Ceramics, Concrete & Wood Stem Size 7/16" x 1-3/8" Load rating, 80 lbs. Has a double ball bearing raceway for easy swiveling and quiet movement Grip ring stem size, 7/16-Inch by 1-3/8-Inch