
Spring loaded plunger expands within the bore which is then locked. The plunger can then be removed and measured with a micrometer. Nickel plated finish. Supplied in wallet with marked ranges. ACCURATE - for accurately measuring bore diameter. PROFESSIONAL - Spring loaded plunger expands within the bore which is then locked. PRECISION - The plunger can then be removed and measured with a micrometer. SMART FINISH - Nickel plated finish. WIDE RANGE - Range: 8-150mm(5/16""-6""). STORAGE WALLET - supplied in wallet with marked ranges.