Precision-machined to correctly center the receiver for lathe turning - ensures that receiver ring and threads will be square. Lets you use a tool-post grinder for fast, accurate recontouring of external surfaces - like removing a Mauser's charger guide. Mfg: Brownells SPECS: 12-3/8" (31.34cm) long. 1½" lb. (.68kg). Steel. Models for Small Ring Mauser (SR), Large Ring Mauser (LR), 03 Springfield (SP), Rem, 7000 (700) and Win. Model 70 (70).