Material: carbon steel
Product specifications: 8-150mm (6 pcs)
Process: nickel plating on the surface
Features: The surface of the telescopic rod is smooth, its side head curvature is good, the surface of the product is nickel-plated, the product has a long service life and the outer surface is bright.
How to use: The spring piston that telescopes in the hole (or groove) can detect the inner diameter, and then measure the reading with a micrometer or caliper (with a knurled locking device at the end)