12.5MM metric long two-color sleeve

About Product:Products adopt high-quality chrome vanadium steel 50 bv30 quality cold forging and becoming, through the whole mesh belt quenching, heat treatment, Product surface double color three layers of nickel and nickel chrome plating, roll the blue ribbon, nickel layer thickness is not less than 0.005mm, Plating layer is not less than 0.0013mm, six Angle of thin wall design, suitable for narrow space, drive arc Angle design, locking force is not easy to skid.