The TRUGLO Choke Tube/Sight Combo is designed for 12 Gauge shotguns and features the Winchester Winchoke/Invector thread pattern. This combo includes one precision CNC-machined choke that accepts all turkey loads, including Hevi-Shot, while being incompatible with steel shot. The package also comes with a TruGlo Gobble Dot Universal Turkey Sight, which fits all ventilated rib shotguns regardless of width or tapering.Key FeaturesChoke Included: Comes with one extended choke designed for turkey hunting.TruGlo Gobble Dot Sight: Extremely low-profile sight with a front diameter of .060" and a rear diameter of .035".Wrench-Free Installation: Designed for easy installation without the need for tools.Endorsement: Endorsed by the National Wild Turkey Federation.