Stem casters are a type of wheel assembly that connects to the bottom of furniture or equipment via a stem — a cylindrical rod that inserts into a socket, bracket, or tubing. This design differs from plate casters, which attach with a flat metal plate. The stem itself can vary in type: threaded, grip ring, grip neck, or expanding adapter. This variety allows stem casters to be used on... https://www.zupyak.com/p/4580389/t/stem-casters-the-unsung-heroes-of-mobility