FOWLER 0-3"" ECONOMY MICROMETER SET .0001"" READING (.01MM ON METRIC SET) CARBIDE MEASURING FACES RATCHET THIMBLE AND LOCKING NUT COMPLETE IN A ""SHOP HARDENED"" MOLDED CASE. MICROFINE GRADUATIONS SIZES OVER 1"" INCLUDE STANDARD. MEETS OR EXCEEDS FEDERAL SPECIFICATIONS.