The DEWALT DT71501 56 piece Drilling & Screwdriving set is ideal for wood drilling, metal drilling and screwdriving applications. It comes in a medium size tough case for convenient storage and portability of the high quality professional screwdriver bits. These are designed with a flexible torsion zone to absorb torque peaks and reduce breakage. The flatwood drill bits have a ground central point and a ground chip breaker for clean, accurate cutting and improved drilling efficiency with reduced wood splintering. The HSS-G metal drill bits are precision ground twist drill bits for rapid drilling, long life and excellent concentricity. The set contains: 7 x Drill Bits: 3, 4, 5, 6, 8, 10, 12mm.2 x Flatwood Bits: 14, 20mm.4 x Philips 25mm Bits: PH1(2), PH2(2).2 x Slotted 25mm Bits: SL6, SL8.27 x Pozi 25mm Bits: PZ2(25), PZ3(2).10 x Torx 25mm Bits: T10(3), T20(3), T25(2), T30(2).2 x Nut setters: 8, 10mm.1 x Adaptor 1/4in to 1/4in square.1 x Adaptor 1/4in to 3/8in square.