FEATURES-20 gauge-Skeet-Stainless steel with titanium nitride finish-Longer choke taper inside Invector-Plus choke tubes for use with back-bored barrels-Stainless steel barstock is heat treated prior to machining-Titanium nitride surface 72HRC hardness for excellent wear & reduced plastic buildup-Absolutely perfect concentricity for superior patterning-Extends beyond the barrel for easy removal and installationPRODUCT SPECIFICATIONS:Dimension 1.50 X 4.55 X 6.20Height 1.5000Width 4.5500Length 6.2000GAUGE 20GACHOKE/ID SKEETFLUSH OR EXTENDED EXTENDEDMATERIAL STAINLESS STEELTHREAD PATTERN INVECTOR PLUSNO DIRECT SHIP TO CALIFORNIA