Carlson's choke tubes are among the best in the business, and provide dependable service for a lifetime to their owners. High quality steel, and tight tolerances ensure the best possible patterns in all of your shotguns. Carlson's Extended Turkey Choke Tubes are high quality and easy to use, the knurled end allows for quickly changing chokes, should the need arise. Manufactured from 17-4 heat treated stainless steel to withstand heavy buffered turkey shotshells. These choke tubes produce extra tight patterns with copperplated and buffered lead turkey shotshells. These chokes produce dense patterns and carry a lifetime warrenty. Each choke extends approximately 1" from the end of the barrel. They have a matte blue finish. These chokes should not be used with steel shot.Specifications and Features:12 Guage Win ChokeExtended Turkey choke tubeTurkey constriction.670" DiameterStainless steelNot compatible with steel shotFits: 12 Guage Winchester ShotgunsMossberg Accuchoke shotgunsBrowing Invector