Carlson's Choke Tubes Retay Delta Waterfowl Set - CMLR Black 12ga. 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 Retay Delta Waterfowl 12 Gauge Choke Tube: Manufacturer: Carlson's Choke Tubes Color: Black Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Tube System: Retay Choke Gun Make: Retay USA Shotguns Additional Features: Non-Ported Country of Origin: USA Features of Carlson's Choke Tubes Retay Choke Tube Delta Waterfowl 12ga 2 PK (MR & LR): Retay Package Contents: Carlson's Choke Tubes Retay Choke Tube Choke Wrench Carlson's Choke Tubes 07779: Retay Choke Tube Delta Waterfowl Set - CMLR Black 12ga