Carlson's Choke Tubes Beretta/Benelli Mobil 20 Gauge Delta Waterfowl 2 Pack MR & LR. These choke tubes feature a 25percent longer parallel section in the choke thus throwing more consistent patterns. Each choke tube is knurled on the end to allow for quick and easy removal. Each choke tube has the constriction and size laser marked on the end and body for easy reference.Steel shot may be used through these choke tubes with exceptional results. Do not shoot steel shot larger than BB or any steel load faster than 1550 FPS through the Long Range Constriction. Loads that exceed this size and speed should be used with the Mid Range choke tube. These chokes are backed by Carlson's lifetime warranty. Specifications for Carlson's Choke Tubes Beretta Benelli Mobil 20GA Delta Waterfowl Choke Tube: Manufacturer: Carlson's Choke Tubes Color: Black Fabric/Material: 17-4 Stainless Steel Gauge: 20 Choke Tube System: Beretta/Benelli Mobil Choke Type: Mid Range/Long Range Diameter: 0.59 in 0.6 in Gun Make: Benelli Beretta Quantity: 2 Pack Additional Features: Non-Ported Included Accessories: Choke Wrench Country of Origin: USA Features Delta Waterfowl 20ga 2 Pk (MR & LR): Beretta/Benelli Mobil Package Contents: Carlson's Choke Tubes Beretta Benelli Mobil 20GA Delta Waterfowl Choke Tube wrench Carlson's Choke Tubes 07111: Beretta/Benelli Mobil 20 Gauge Delta Waterfowl 2 Pack MR & LR