Drill America DEWCCD premium quality double end drill used for drilling truck and auto bodies, or any thin sheet metal. popular for pop rivet drilling applications. 135 degrees self-centering split point aids in penetration. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge. Round shanks allow use with a wide variety of toolholding systems . When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging.