Caster Classics Antique Finish Ball Chair Caster blends with vintage or modern decor. 2-inch molded (hard) plastic wheel for low pile carpet or other non-sensitive flooring. Not suitable for hardwood or laminate. Caster is designed for chairs or other wood furniture with wooden legs or a wooden base. Universal 5/16 x 1-1/2 mounting stem with metal mounting socket included. 2-3/8 mounting height. Not recommended for loads over 240 lbs. Model number 7ACB50S90VB04 - 4-Pack Caster Classics® 2-inch Antique Brass Ball Caster with Wood Stem & Socket contains four (4) casters four (4) mounting sockets.