Chromcraft Caster Converter Glides set of 16 Convert any office chair with casters to a stationary chair without losing the chair height Base diameter provides stability , Keeps chairs from rolling 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 Will not scratch or scuff floors if floors are kept clean Simply pull out old casters and hammer in new glides with rubber mallet