PERFECT SIZE: For precise drilling of different sizes from 5-35mm in diameter, one drill can handle holes of different sizes. QUALITY MATERIALS: Classic high speed steel, titanium coating on the surface,Suitable for drilling holes in aluminum plates with a thickness of 1 to 4mm, also suitable for plastic and wood。 LASER ENGRAVING: The size is laser engraved into the metal, so it will not wear out even if reused, making it easier to drill accurately. EASY TO DRILL: The marking hole position and double flute design make drilling faster and smoother, as well as accurate drilling. PRECISE POSITIONING DRILL BIT: When you press the surface, it produces automatic, high-impact, spring-loaded striking force, and an adjustable hood can adjust the striking force. The knurled surface of the HSS body is very non-slip, providing precise positioning points without worrying about deviation. Features: No need to use center punch, compared with ordinary drill bit is not easy to be broken. With just a