Carlson's Choke Tubes 12 Gauge Delta Waterfowl Choke Tube Set Benelli Crio Plus. These Choke Tubes made by Carlson's Choke Tubes feature a 25percent longer parallel section in the choke thus throwing more consistent patterns. Each Waterfowl Choke Tube Set for 12 Gauge Shotguns by Carlson's Choke Tubes is knurled on the end to allow for quick and easy removal. Each Carlson's Shotgun Choke Tube has the constriction and size laser marked on the end and body for easy reference. Steel shot may be used through these Carlson's Waterfowl Choke Tubes yielding exceptional results. Specifications for Carlson's Choke Tubes Delta Waterfowl 12 Gauge Choke Tube Sets: Manufacturer: Carlson's Choke Tubes Color: Black Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Type: Close Range-Mid Range-Long Range Quantity: 3 Additional Features: Non-Ported Included Accessories: Choke Tube Case Condition: New Country of Origin: USA Features 25percent longer parallel section Can be used with steel shot Laser marked constriction and size Package Contents: Carlson's Choke Tubes 12 Gauge Delta Waterfowl Choke Tube Sets choke case Carlson's Choke Tubes 07579: 12 Gauge Delta Waterfowl Choke Tube Set Benelli Crio Plus