The Extended Turkey Choke Tubes extend approximately 1″ from the end of the barrel. They are manufactured from 17-4 heat treated stainless steel and have a matte blue finish. The Extended Turkey Choke Tubes feature a 1.050″ parallel section to produce the optimum pattern with your shotgun. *No Steel Shot Larger than #4 may be used in the Turkey Choke Tubes NOTE: Winchester SX-P SX-2 SX-3 & SX-4 use Browning Invector Plus Tubes