Master Caster Bell Glides, 2-3/16" Base, B Stem, 7/16"x7/8", 5/ST, Black - High Profile Bell Glides convert any office chair with casters to a stationary chair without losing the chair height. 2-5/16" height maintains height when used to replace casters. Large 2-3/16" base diameter provides stability. Weight rating is 110 lb. per glide.