This 1.375"-24 HUB Direct Thread Mount will convert HUB compatible suppressors to a direct thread mounting system. To install simply remove your existing mount mechanism from your suppressor and thread on our HUB Direct Thread Mount using a 3/4" open end wrench then simply thread the suppressor onto your barrel.17-4PH Heat Treated Material Black Oxide 1.375"-24 Mounting Threads .45 Cal Bore Weight: 1.7 oz