Features:Converts suppressors with 1.375x24 “HUB” threads to Plan B Material: 17-4 PH stainless steelFinish: Black nitride Precision machined Made in OregonBacked by our Lifetime Warranty The Stronghold adapter allows you to run Plan-B threaded muzzle devices on any suppressor with a HUB-style (1.375x24) rear thread. Built to exact tolerances, it's the ideal solution for cross-platform suppressor setups.