Multifunctional high-speed hacksaw drill in one twist drill head woodworking metal rotary head punching slot sawtooth drill

•6-Piece Black Oxide Twist Drill Bit Set is perfect for general purpose drilling materials such as metal, hardwood, cork, PVC and fiberglass

•Parabolic trough design increases chip ejection in metal and wood drilling applications

•Black oxide coating helps resist corrosion and improves durability so your drill bits last longer.

•135° split tip drills into contact to prevent walking on the hard surfaces you're working on

•31° helix reduces the over-aggressiveness of a true parabolic trough, making it ideal for drilling