Indian Creek Blk Diamond Strike 20ga Turkey Choke Invect Plus The Black Diamond Strike is designed to knock turkeys right off their feet. Precision engineered to the industries tightest tolerances, this tube has been proven to kill many a bird. The Strike will accommodate all lead and hybrid heavy loads with shot sizes from #2 through #10. The Strike has been proven to increase pattern density by 40% or better. That means tighter groups, more pellets down range, and more birds in the freezer! Dont settle for anything less, be ready to Strike that trophy gobbler this spring! Features: 20 Gauge standard constriction .555 (.562, .570, .575) MODEL # 0016 BROWNING INV + Precision engineered to the industries tightest tolerances Will accommodate all lead and hybrid heavy loads Proven to increase pattern density by 40% or better