The Lee case trimmer lock stud is designed to be used with only Lee case length gauges and shellholders (sold separately). this handy tool is made from hardened steel, trimming cases to correct specifications has never been easier. The shaft on the lock stud allows the setup to be turned by hand or with an electric drill. Trim length cannot be adjusted as with bench-mounted case Trimmers. Specifications: - fits: Lee case length gauges and shellholders - function: lock stud holds the shellholder - material: steel