Bulge Buster Kit by LEE RELOADING PRODUCTSLee Bulge Buster Kit and appropriate Lee Factory Crimp assures your mixed brass is bulge free. This push through die adapter will quickly remove the annoying bulge rings that shell holder constrained dies simply can't reach. The Bulge Buster Kit includes: extension sleeve and push through punch and catch container and complete instructions. Works with these rimless cases: 380 ACP and 10mm and 40 S&W and 41 AE and 45 ACP and 45 GAP and and 45 Win Mag. NOTE: 9mm cases are not able to be used in the Bulge Buster because it has a slightly tapered case and the rim is not completely flush with the case. WARNING on for Glock Cases. Lee does not recommend "fixing" cases fired in pistols with unsupported chambers and because there is no way to make them safe once they have bulged. The case wall is thinned where it bulges and and resizing the outside of the case back down to the correct diameter does not restore the case back to its original thickness. If this case is fired in a pistol with an unsupported chamber again and and this thinned section of brass happens to line up with the unsupported part of the chamber and there is a high probability that the case will rupture.