Mastercaster Bell glides Bell Glides, Black, 5/16"w x 1-1/2"h Stem Contemporary design, strength and performance make these replacement casters an excellent choice for office and home furnishings. With appropriate stems and fasteners, each caster can be used on wood, metal and tubular metal chairs, furniture and other equipment. All casters carry the manufacturer’s guarantee against defects in material and workmanship. Convert office chairs with casters to stationary chairs without diminishing the height of the chair. Three stem sizes.