PERFECT SIZE: For precise drilling of various sizes from 5-35mm in diameter, one drill can handle holes of various sizes. QUALITY MATERIALS: Classic high speed steel, titanium coating on the surface, proven performance and durability in drilling holes in plastics, wood, aluminum, copper, stainless steel and many other types 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 ENGRAVED: The size is laser etched into the metal, so it won't wear out even if reused, making it easy to drill precisely. EASY TO DRILL: Marking hole position and double flute design make drilling faster and smoother, as well as precise drilling. PRECISE POSITIONING DRILL: When pressed on the surface, it produces automatic, high-impact, spring-loaded punching force, and an adjustable hood allows you to adjust the punching force. The knurled surface of the HSS body is very non-slip,providing precise positioning points without worrying about deviations. Features: No need to use center punch, compared with the ordinary drill bit is not easy to be broken. With just a small amount of pressure needed and automatically burr holes as you drill. Provides fast, smooth and clean cuts, each step is clearly marked with depth diameter. Specifications: Material: HSS Steel with Titanium Plated Stem type: Round stem Color: silver Models: 5-35mm Stem diameter: 13mm Hole size: 5mm, 7mm, 10mm, 12mm, 15mm, 17mm, 20mm, 22mm, 25mm, 27mm, 30mm, 32mm, 35mm (13 pitches) Length: Approx 7.2cm / 2.7