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.