Master Caster Bell Glides,2-3/16" Base,K Stem,3/8"x1",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.