HUNTERS SPECIALTIES STRUT UNDERTAKER XT HIGH DENSITY PORTED 12GA CHOKE TUBES The Undertaker XT High Density Choke Tube works with High Density Hevi-Shot, bismuth and tungsten loads in 12 gauge shotguns. Features blued finish, 3-inch long tube. Knurled end for hand installation. Fits all 2-3/4"", 3"" and 3-1/2"" guns. GUN CATEGORY CHART: A - Remington, Charles Daly; B - Mossberg 835, 935, Maverick 91; C - Winchester, Mossberg, Maverick 88, Browning Invector, Weatherby, Ithaca, H&R, Charles Daly O/U, Thompson Center; D - Beretta Mobil, Benelli, Franchi, Traditions ALS 2100, Stoeger, Gazells; E - Beretta Optima Plus, Extrema, AL391, Benelli Vinci & Super Vinci, SBE2, M2 Super 90; F - Winchester Super X2 & X3, Supreme, Browning Invector Plus. NOTE: Choke and shot size performance will vary depending on ammunition, target distance and hunting conditions. The only way to really know what kind of pattern you are getting from each choke tube and ammo is to ""pattern test"". HUNTERS SPECIALTIES - TOP-QUALITY HUNTING ACCESSORIES They say a craftsman is only as good as his tools. We believe the same holds true for hunters. That's why we make purpose-driven hunting tools that stand up to any conditions and are guaranteed to work when you need them to. No gimmicks.