This 11mm professional Colt drill bit is made from M2 High-Speed Steel and has been designed specifically for drilling pen blanks. The parabolic flute shape clears the chips without repeatedly having to back the bit out during the cut and also has less heat build-up. Each drill bit has cleaner entry and exit holes and can easily be re-sharpened. It will work well in cross grain and end grain, making it ideal for woodturners.