Koken 1 2"Dr Deep Socket 12 point 28mm Mitutoyo Small Tools 01mm graduations Screw Thread Outside 01mm graduations Screw Thread Outside Micometer Anvils and spindle tips are interchangeable in matching pairs to enable measurement of Metric Unified or Whitworth threads Direct reading of screw pitch diameter (no need for calculation) Equipped with ratchet stop for constant measuring force Interchangeable anvils are optional and are ordered separately The Value Touch Latex Disposable Glove features excellent touch sensitivity 4305M Deep Socket 1 2"Dr 28mm4305M 1 2"Dr Deep Socket 12pt 28 x 77mm please go by the product title when purchasing