This choke uses a special field-tested constriction and length to get the most from Blind Side� Ammunition�s new configuration. Carlson�s Blind Side� Choke Tubes allow Winchester� Blind Side� HEX Steel Shot and Diamond Cut Wad to do its job and helps deliver devastating downrange patterns.This choke tube performs equally well when used with other steel shot loads. Carlson�s Blind Side� Choke Tube is a proven performer on waterfowl using all steel shot loads over extended distances.This choke is also designed to shoot lead plated copper and nickel shot as well as all Hevi-Shot� ammunition with great results.