Description of Drill America KFDRSD11 16 Reduced Shank
High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Gold and black surface treated for use in stainless steel and other hard metal drilling. Round shanks allow use with a wide variety of tool holding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. Heavy duty 135 degree split point.
I had to open four 1/2" holes in a trailer frame that was about 1/8" thick. The exercise lasted three of the four holes and was kicked off. I had to get to work and resharpen to finish the fourth hole. The lead angle on the bit wasn't the greatest out of the box.