The Midas touch. Our exceptional .410 Bore Midas Grade Standard Invector Extended choke tubes are available in constrictions from Cylinder to Full. All Browning Invector tubes are set to industry constriction standards. – Extends beyond the end of the barrel for easy removal and installation – Stainless steel construction with black oxide finish – Laser-etched black chrome accent band – Minimum gap geometry plus high-resolution RMS finish reduce plastic buildup in bore – Available in constrictions from Cylinder to Full – Fits .410 Bore Standard Invector choke system ONLY – Flat choke tube wrench is not compatible with Midas Grade Extended choke tubes