Carlson's Choke Tubes Winchester 12 Gauge Choke Tube Delta Waterfowl 2 Pk.. 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.To fit Winchester Browning Invector Mossberg 500 Weatherby Pre 1993 Ruger Red Label. Winchester SX-2SX-3 & SXP use Browning Invector Plus tubes Specifications for Carlson's Choke Tubes Winchester 12 Gauge Delta Waterfowl Choke Tube: Manufacturer: Carlson's Choke Tubes Color: Black Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Tube System: Mossberg Accu-Choke Winchester Choke Browning Invector (Standard) Choke Type: Mid Range/Long Range Diameter: 0.71 in 0.7 in Gun Make: Winchester Mossberg Browning Quantity: 2 Additional Features: Non-Ported Included Accessories: Choke Wrench Features Delta Waterfowl 12ga 2 PK (MR & LR): Winchester Package Contents: Carlson's Choke Tubes Winchester 12 Gauge Delta Waterfowl Choke Tube wrench Carlson's Choke Tubes 07470: Winchester 12 Gauge Choke Tube Delta Waterfowl 2 Pk.