Extends beyond the barrel for easy removal and installation. No wrench is necessary. Tubes feature minimum gap geometry plus high-resolution "RMS" finish that reduces buildup of plastics in the shotgun bore. All tubes are made of stainless steel and given a black oxide finish. Specifically designed for clay targets. Fits Invector Plus 12 gauge barrels only. Notes: Extends .7" beyond the muzzleSpecifically designed for clay targets.For use in Browning back-bored/Invector Plus barrels only. Do not use in Invector barrels.