Super-Waterfowl 
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These chokes are extended, knurled and have a black oxide finish. they are available in three degrees of full choke- .030, .040, .050 and were 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. 
Super-Waterfowl Choke Shot Chart
Choke Size           Steel Shot           Tungsten Alloy           Hevi Shot
Full #1 -.030       F thru BBB            All Sizes                     All Sizes
Full #2 -.040       BB thru # 2            All Sizes                    All Sizes
Full #3 -.050       #3 thru #6              All Sizes                    All Sizes