Adapts your 12 Ga shotgun to shoot .410 Ga shells. With these shotgun adapters, you can maximize the use of your shotgun by being able to shoot other gauges and even rifle and pistol calibers in your shotgun. This shotgun adapter is simple and easy to use. The bullet inserts into the adapter, and the adapter inserts into the chamber of your single shot or double barrel. shotgun. Will work in bolt action too if placed in chamber by hand. (They don't work well with auto-loading or pump shotguns) The discharged shell will slide out of the adapter easily. Shoot smaller gauge shells, rifle, pistol bullets in your shotgun. The machined steel adapter allows smaller (cheaper) ammo, even .38 or .22 caliber to be shot. The adapters that shoot rifle calibers are not intended to take the place of an actual rifle. But they are handy to have with you when you are carrying your shotgun to increase your options. These adapters are about 2 3/4" long. They can shoot 3" shells too. List of all adapters available: 10 Gauge to 20 gauge 10 Gauge to .45 ACP 10 Gauge to .44 Magnum 10 Gauge to 9mm Luger 12 Gauge to 20 Gauge 12 Gauge to 28 Gauge 12 Gauge to .45 ACP 12 Gauge to .410 Gauge 12 Gauge to .44 Caliber 12 Gauge to .357 /.38 Caliber 12 Gauge to 9mm Luger 12 Gauge to .32 Caliber 12 Gauge to .22 Caliber 16 Gauge to 28 Gauge 16 Gauge to .45 ACP 16 Gauge to .410 Gauge 16 Gauge to .44 Magnum 16 Gauge to .357 /.38 Caliber 16 Gauge to 9mm Luger 16 Gauge to .32 Caliber 16 Gauge to .22 Caliber 20 Gauge to .45 ACP 20 Gauge to .410 Gauge 20 Gauge to .44 Magnum 20 Gauge to .357 /.38 Caliber 20 Gauge 9mm Luger 20 Gauge to .32 Caliber 20 Gauge to .22 Caliber .410 Gauge to .32 Caliber .410 Gauge to .22 Caliber web: shotgunadapter dot com