Semi Circular Type Screw Gauge Micrometer comes with oxidized threaded steel rod that provides smooth movement and with zero adjustment screw. The Screw Gauge Micrometer is used for precise measurements of diameter or thickness. The Screw Gauge Micrometer is available in size of 0-15 X 1/100mm. The Semi Circular Type Screw Gauge Micrometer is available in a suitable cardboard / plastic case for convenient storage.