Allen Engineering Brake Wrench 

Installation tool for the Allen muzzle brake

Made in the USA by Allen Engineering, the tool is heavy-duty enough to install or remove an AEM brake, yet soft enough not to make a mark on the stainless brake.  Made from a solid billet of aluminum, it is a little more than 1/2" thick, and anodized black.

Will work on Allen Engineering brakes, as well other AEM/Ops Inc style brakes, like that from Otter Creek