** THE LATEST IN INVECTOR PLUS CHOKE TUBE TECHNOLOGY ** EXTENDS BEYOND THE BARREL FOR EASY REMOVAL AND INSTALLATION-NO WRENCH NECESSARY ** ABSOLUTELY PERFECT CONCENTRICITY TO PROVIDE SUPERIOR PATERNING ** STAINLESS STEEL BARSTOCK IS HEAT TREATED PRIOR TO MACHINING ** TITANIUM NITRIDE SURFACE WITH 72RC HARDNESS FOR EXCELLENT WEAR AND REDUCED PLASTIC BUILD-UP ** SPECIFICALLY DESIGNED FOR CLAY TARGET SHOOTING ** FOR BROWNING 12 GAUGE BACK-BORED BARRELS ONLY(INVECTOR-PLUS)