FEATURES -Winchester, Mossberg, Maverick 88, Browning Invector, Weatherby, Ithaca, H & R, Charles Daly O/U,Thompson Center-Designed for lead& copper plated shot in 12 and 20-gauge shotguns-Blued finish, 3" long tube-Knurled end for easy hand installation-Fits all 2 3/4", 3", & 3 1/2" guns