Micrometer screw gauge is used for measuring extremely small dimensions. Can even measure dimensions smaller than those measured by a vernier Caliper. Strong rugged metal construction. Measuring screw handle, Satin finish with friction knurling for easy rotation. With locking mechanism to hold measurements. 1645 Gauge Micrometer in Pouch, Reading 0 -10mm 1646 Gauge Micrometer in Pouch, Reading 0 -15mm 1647 Gauge Micrometer, Reading 0