RCBS 87310 Case Master GAUGING Tool

A quick convenient way to determine several important case and cartridge dimensions. The CaseMaster gauging tool measures case neck concentricity uniformity and thickness as well as case length and bullet run-out. All are important to accuracy and safety. Detects case head separation before symptoms are apparent on the outside of case. Much quicker than a dial caliper and makes a tedious job simple and less tiring.