6.3mm metric mirror short sleeve

About Product:The product is made of 50BV30 high-quality chromium-vanadium steel, after The overall quenching and heat treatment of The mesh belt. The surface of the product is treated by two-color three-layer ni-ni-cr electroplating, the thickness of the nickel layer is not less than 0.005mm, and the chrome layer is not less than 0.0013mm. Six-angle thin-wall design, suitable for small space use, drive arc internal Angle design, the locking force is strong and not easy to slip.