Trulock Sporting Clays style choke tubes are the premiere grade of tubes. They are extended length chokes with a bright finish and are knurled for easy removal and installation. They are made from heat-treated stainless steel. FeaturesTubes are Extended and Knurled for hand removal and also notched for use with a choke wrench Extremely smooth interior finish May be used with steel shot from Cylinder thru Improved Modified constrictionAll chokes are marked on the extended knurled portion with Choke and on the body with the degree of choke and exit diameterPorted tubes help reduce recoil and strip the wad to insure uniform patterns