Material: Made from 17-4 stainless steel; Finish: Bright Stainless finish; Precision Machined: Ensures superior performance over standard choke tubes; Enhanced Patterning: Features a 25% longer parallel section for more consistent patterns; Easy Installation: Knurled end for quick and easy removal or installation; Constriction Marking: Constriction level lasered on the end for easy reference; Versatile: Suitable for use with Lead shot, Steel Shot, Copperplated Shot, Nickel Shot, Hevi-Shotshells, and Buck Shot; Compatibility Warning: Not recommended for steel shot larger than BB in tighter than Full Constriction tubes; Pattern Quality: Provides tighter and denser patterns compared to Flush Mount Choke Tubes, thanks to the longer parallel section