Works with high density Hevi-Shot, bismuth and tungsten loads in 12-gauge shotguns. Blued finish. 3-inch long tube. Knurled end for easy hand installation. Fits all 2-3/4'', 3'' and 3-1/2'' guns. For: Winchester, Mossberg 500, Maverick 88, Browning Invector, Weatherby, Ithaca, H & R, Charles Daly Over and Under, Thompson Center.