DEWALT 21-pack black oxide twist drill bit set is ideal for general-purpose drilling materials like metal, hardwood, softwood, PVC and fiberglassParabolic flute design increases chip ejection in metal and wood drilling applicationsBlack oxide coating helps resist corrosion and increase durability, so your drill bits last longer135° Split-point tips drill on contact and prevents walking on the hard surface you’re working on31° Helix reduces over aggressiveness of true parabolic flute, making it ideal for drilling deep holes
