Description FEATURES:-Caliber:28 gauge-Constriction: improved cylinder-Manufactured from high strength steel -Finished in a nickel-alloy coating-Fits Beretta A400 Xtreme, A400 Xplor, A400 Xcel, 690, 692, DT11, A300 Xtrema, SV10-Fully interchangeable on all Beretta barrels that are threaded for Optima-Choke® HP PRODUCT SPECIFICATIONS: Dimension     1.55 X 3.20 X 6.20 Height     1.5500 Width     3.2000 Length     6.2000 GAUGE     28GA CHOKE/ID     IMPROVED CYLINDER FLUSH OR EXTENDED     FLUSH MATERIAL     STAINLESS STEEL THREAD PATTERN     OPTIMA HP