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. 7/16" x 7/8" (11mm x 22mm) grip ring mounting stem. Caster is designed for chairs with a plastic or metal base that accept a 7/16 x 7/8 grip ring stem. 2-5/8 mounting height. Not recommended for loads over 240 lbs. dynamic (rolling weight). Rated to 70 lbs per caster static (stationary) weight. Model number 7ABB50S10VB5 - 5-Pack Caster Classics® Antique Finish Ball Chair Caster five (5) casters.