The CRT-25 carbon removal tool frpm Magna-Matic, is designed for the cleaning and maintenance of the SR-25 and AR-10 family rifles. One side of the tool is like a reamer to clean the inside of the bolt carrier, the other side of the tool is like a lathe to clean the bolt tail radius. The movable arm allows an officer to clean any bolt tail radius, and ensures proper bolt operation. The CRT-25 is all steel, zinc plated for corrosion resistance, and 100 percent made in the USA. Save time with a tool specifically to remove carbon from problem areas of the AR-10 family bolts and bolt carrier.