This listing is for one 5x1.25" sheet pan rack caster with a polyurethane wheel with a precision ball bearing and a 0.860" x 2" square stem with a 3/8" 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 message with your order.