Benelli Crio Plus Super WaterFowl 12 Gauge Full Choke, #3 These chokes are extended, knurled and have a black oxide finish. Specifically designed for use with steel and other environmentally friendly shot. this is the ultimate choke for LONG RANGE pass shooting of waterfowl. All Super Waterfowl chokes are manufactured from a unique grade of alloy steel that has a strength level of approximately twice that of 17-4. they are marked on the head with the degree of choke and on the body with the exit diameter. Fits: Benelli Crio Plus 12 Gauge Extended Constiction: .675