Carlson's Choke Tubes TruChoke 12 Gauge Extended Turkey Extended Turkey .660 90081. These choke tubes feature a 25percent larger parallel section in the choke thus throwing more consistent patterns than conventional choke tubes. Each choke tube is knurled on the end to allow for quick and easy removal. Each choke tube has the constriction laser marked on the end for easy reference. These choke tubes are backed by Carlson's lifetime warranty. Specifications for Carlson's Choke Tubes TruChoke 12 Gauge Extended Turkey: Manufacturer: Carlson's Choke Tubes Color: Stainless Fabric/Material: 17-4 Stainless Steel Gauge: 12 Choke Tube System: Tru-Choke Choke Type: Turkey Quantity: 1 Additional Features: Non-Ported Country of Origin: USA Features of Carlson's Choke Tubes TruChoke 12 Gauge Extended Turkey Tru-Choke 12ga Extended Turkey .660 Package Contents: Carlson's Choke Tubes TruChoke 12 Gauge Extended Turkey Carlson's Choke Tubes 90081: TruChoke 12 Gauge Extended Turkey Extended Turkey .660