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 1-4mm, also suitable for plastic and wood LASER ENGRAVING: The size is laser engraved into the metal, so it won't wear out even if reused, making precise drilling easier. EASY TO DRILL: Marking hole position and double flute design make drilling faster and smoother, precise drilling. PRECISE POSITIONING DRILL: When you press on the surface, it produces automatic, high-impact, spring-loaded striking force, and an adjustable hood allows you to adjust the striking force. The knurled surface of the HSS body is highly non-slip, providing precise positioning points without worrying about deviations. Features: No need to use punch, compared with 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. Specification: Material: HSS Steel with Titanium Plated Shank Type: Round Shank Color: silver Models: 5-35mm Shank 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" Package Includes: 1 x HSS Steel Cone Drill Bit 5-35mm