These are used to sight your airsoft rifles or pistols in with ease . Just put the laser bore sighter in your barrel then adjust your scope or red dot 🔴 to the laser point and your sighted in with out wasting 30-40 mins Product details Brand Bayattoo Color Red Sport Type Hunting Material Aluminum Compatible Devices Handgun, Shotgun, Rifle 12 ADAPTERS: More adapter size options than other brands. Laser bore sight kit with multiple caliber fit any 0.17 to 12ga handguns, rifles, shotgun, which allows the accurate bore alignment of scopes, iron sights or laser sights on handguns and rifles. CAUTION: This tool is not available for the barrel with silencer. Keep the red laser beam away from eyes. HIGH ACCURACY: We tested every product twice before it is packed, and the upgraded adapters insures the boresighter is much more accurate than others. EASY TO USE: Comes with tools, just following using manual, choosing proper size adapter and insert the laser unit in the muzzle. 【LONGER BATTERY LIFE】: Upgraded the battery of the laser bore sight - 2 CR2 battery has ultra-long battery life and longer service life.