Change any office chair with casters to a stationary chair using these handy bell glides. The 2-1/2" height makes sure you don't lose your chair height. 2-1/4" base diameter provides stability. The nylon glides are equipped with large stems made of chromed metal.Change any office chair with casters to a stationary chair using these handy bell glides. The 2-1/2" height makes sure you don't lose your chair height. 2-1/4" base diameter provides stability. The nylon glides are equipped with large stems made of chromed metal.