KAK Industry Custom 40MM reloading die Components to load your own blank rounds for 40MM casesSpring loaded seating stem seats gas check into place, die then crimps brass casing securing gas check into placeIncludes - Complete reloading die with lock ring 25x 38 S&W Brass25x Copper Gas Checks Die is threaded for all popular presses/ bushings- 7/8"-14 Uses #6 RCBS Shell holder (not included) Disclaimer, as anyone who reloads will know, when reloading your own ammo you need to take precautions. The factors that come into play with producing loads yields an endless list- elevation, barometric pressure, humidity, lot of powder, lot of primers, tight chamber, loose chamber, rifling, so forth and so on. Just because a particular load works for us it may not work for you, work your loads up safely. KAK Industry takes no responsibility for mishaps just as any component manufacturer does.