Hornady Standard Micrometer Instrument - This versatile Standard Micrometer instrument accurately measures minute distances for precise readings on bullets or objects up to 1-inch in size in 0.0001-inch increments. Spindle Lock Preserves Measurement When Removing Micrometer From Work Piece Ratchet Stop Allows Uniform Pressure To Enhance Measurement Repeatability Plastic Storage Case Protects Micrometer When Not In Use Baked-Enamel Finish On C-Frame Provides Durability