This Hoop Earring Mandrel also comes with a threaded rod attachment for hands-free use! Each 12″ hoop mandrel now includes this hardened steel rod feature. Easily screws on to the bottom of the mandrel and extends just enough to fit in a vise or simply put in a hole in your bench or work table. Holds securely and is easy to use. Mandrel tapers from 3/8″ to 2″ (10mm to 52mm).