This listing is for a set of four 5x1.25" sheet pan rack casters with a polyurethane wheel with a precision ball bearing and a 0.860" square grip ring stem with a 0.25" bolt hole 1" up from the stem base. This caster will fit most all Regency, Advance Tabco, Channel and many other brand sheet pan racks. We can install an optional spring ring on the stem if the hole location doesn't match your rack; please specify when ordering by sending a note with your order.