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 surface, proven performance and durability in drilling holes in plastics, wood, aluminum, copper, stainless steel and many other types of sheet metal. Titanium alloy drill bits are especially suitable for processing copper and aluminum parts/die steel/spring steel/cast iron parts/iron and other metal materials. LASER ENGRAVING: The size is laser engraved into the metal, so it does not wear even if reused, making precise drilling easier. EASY TO DRILL: The position of the marking hole and the Double flute design make drilling faster and smoother, as well as precise drilling. PRECISE POSITIONING DRILL: When you press on the surface, it produces automatic hitting force, high impact , spring loaded, and an adjustable hood allows you to adjust the striking force. The knurled surface of the HSS body is very non-slip, providing precise positioning points without worrying about deviations. Note: The data are all measured manually, please allow 1-3cm error due to Due to light and display differences, there may be color differences, please refer to the actual item received.