The Drill and Tap Extractor Set is used in conjunction with our Extractor Housing on those tough, stubborn shell casings that has a lip too damaged to free using our extractor plates. ( Remove the depriming assembly prior to attempting to remove the stuck case.) First, screw in the die into the housing. Next, using the drill provided, drill the stuck case out by using the drill guide on the bottom of the Extractor Housing. Next, tap the hole and use the bolt and washer provided in the kit to remove the stuck case.