The Lee Bulge Buster Base Sizing Kit is the perfect accessory to make reloaded ammunition more reliable. This kit installs quickly, easily and is a breeze to operate. After installed in a Lee Carbide Factory Crimp Die (Not Included) all the reloader does is push through a pistol case that exhibits a low base bulge. The carbide sizing ring from the factory crimp die removes the bulge producing more reliable ammunition. Kit is designed for use in a single station press with the index rod removed.Fits: Lee Factory Crimp Dies (380 ACP, 40 S&W, 10mm Auto, 41 AE, 45 GAP, 45 ACP, 45 Win Mag Notes: Will not work with 9mm Luger Includes: extension sleeve, push through punch, catch container and complete instructions