This wrench covers pretty much every aspect of our mounts for the Mystic X family of silencers. It fits the booster housing to help remove it from the silencer, it fits the booster retaining cap to make removal of the cap easier. It also fits the inside of the FBA to help remove them from under handguards on short barrel applications, also it fits the LoPro slots to help get them out of the back of the can. On top of this, it fits the 3 lug mount to help hold this part for removal or disassembly. It even works with the HATE ring… So it pretty much does everything. These are made from steel with a black nitride finish.