Fits the Remington ProBore Choke System 12 Gauge. TruGlo's best selling turkey chokebrbr- Precision CNC-machined Accepts all turkey loads, including Hevi-Shot No steel shot Endorsed by the National Wild Turkey Federation Combo Bonus - Free TruGlo Gobble-Dot Universal Turkey Sight: TruGlo's original turkey sight - new and improved Fits all ventilated rib shotguns regardless of width or tapering Extremely low-profile Front diameter is .060"; rear diameter is .035" Endorsed by the National Wild Turkey Federation