Made of high-quality steel, the surface is plated with nickel, and the service life of the product is long. Six telescopic gauges with different can be used to quickly measure the inside of the hole. The telescopic rod has a smooth surface and a good radian of the probe. The rhombic anti-slip handle makes the measurement more convenient. The tail has a locking device (tighten clockwise and loosen counterclockwise) describe: Name: telescopic gauge Specification: 3-13mm Product application: Permits use in holes, slots and recesses Material: steel colour: silver Package Contents: 4 x Telescopic gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.