This is a TruGlo Gobble Stopper Extreme Choke Tube for 20 Gauge Remington & Charles Daly. TruGlo's best selling turkey choke! Precision-machined ported turkey tube. Accepts all turkey loads, including Hevi-Shot. Wrench-free installation. No steel shot. Endorsed by the National Wild Turkey Federation. This choke tube is for 20 Gauge Remington 870/1100/11-87, and Charles Daly pumps and semi automatic shotguns.