Browning Extended Invector-DS 12 Ga. Choke Tube Improved Cylinder Keeps going and going. This is a choke tube that is long on length and even longer on performance. Each tube extends beyond end of the barrel for easy removal and for the most even, tight patterns in Browning's history of choke tube design. Features: - Proprietary differential banded gas seal eliminates residue build up and makes chokes easy to remove and install - Integrated spring suspension holds the seal tight, yet allows expansion against the barrel wall for a perfect fit and a smooth transition for shot column entering choke - Gas is controlled at the interface between choke and where it seats in the bore - From skeet to full choke, patterns tighten consistently and reliably Specifications: - Choke Gauge 12 - Material Nickel Chrome Moly - Pockets Chrome - Choke Pattern Percentage 40%-45% - Choke Notches IIII Manufacturer: Browning MFG Number: 1134283 UPC: 023614373551