This listing is for a set of four 5x1" sheet pan rack casters with rubber wheels and an 0.860" x 1-15/16" square stem with a 0.25" bolt hole 1" up the base and an additional 1/4" bolt hole 1-5/8" up from the stem base. This caster will fit most all Regency, Advance Tabco, Channel and many other brand sheet pan racks