Carlsons 11565 Cremator Optima HP 12 Gauge Mid-Range 17-4 Stainless Steel Black Ported Carlson's Cremator Choke Tubes Feature Our New Triple Shot Technology And Is offered In Close Mid And Long Range constrictions. TST Is a Series Of Three graduated Rings In The Taper Section Of The Choke Tube, That Allow a More Gradual Transition From The Shotgun Bore To The Final Constriction. The Cremator offers Reduced Pellet deformation, Less flyers, More Dense patterns, Wrench-Less Installation, Quick Removal And Muzzle Protection. Made In The USA. *Note- Optima HP And Remington Pro Bore Long Range Cannot Be Used With Any Steel Shot larger Than #2. Gauge: 12 Gauge Configuration: Optima HP Finish: Black Chokes Included: 1 Material: 17-4 Stainless Steel