Carlsons 20003 Benelli Crio Plus 12 Gauge Flush Modified 17-4 Stainless Steel Made In The USA, These Chokes Are For The Beretta/Benelli Mobil shotguns. Steel, Lead, & Hevi-Shot May Be Used In This Constriction, However, No Steel Shot larger Than #BB Or speeds Exceeding 1550 Fps Should Be Used In Choke Tube tighter Than Full. It Is constructed From 17-4 Heat Treated Stainless Steel. Gauge: 12 Gauge Configuration: Benelli Crio Plus Finish: Stainless Steel Chokes Included: 1 Material: 17-4 Stainless Steel