Heman Miller Aeron Compatible Bell Shape Stationary Glides (Set of 5) These are replacement stationary glides for Herman Miller Aeron Chairs Convert any office chair with casters to a stationary chair without losing the chair height Bottom Diameter : 2" , Height Not Including Metal Stem : 2 1/4" , Metal Stem Height : 7/8" , Overall Height : 3 1/4" Will not scratch or scuff floors if floors are kept clean Height of bell shape glide is the same as a caster - chairs will be the same height as the glide will compensate the height of a caster