6 PCS / Set Round Head Inner Diameter Telescopic Gauge, Adjustable Inner Diameter Gauge: 8-150mm

1. Material: carbon steel
2. Size: about 20x16 cm/set
3. Weight: about 260g/set
4. Specifications: 8-150 mm (6 pieces)
5. Scope of application: molds, hardware, electronics, etc.
6. Features: nickel-plated surface, spring piston, smooth surface, rhombic non-slip handle, more convenient for measurement, and a locking device at the tail (clockwise to tighten, counterclockwise to loosen), strong and durable

Instructions:
1. Pinch the inner diameter ruler tightly and put it into the object to be measured
2. Rotate once to ensure that there is no skew
3. After the measurement is correct, tighten the lock clockwise
4. After locking, measure the inner diameter data with a caliper