The Little Crow Gunworks Locking Ring Wrench is the only one of its kind currently on the market. This tool is a "Must Have" for doing Barrel work, such as: Re-Barreling, Muzzle Threading or adjusting Headspace. The all steel construction make it durable, with a brass shim to protect the finish on your lock ring. The durable design will stand up to hard use by a Professional Gunsmith but the ease of use and price make it an affordable tool for the gun hobbyist.