Drill America KFD3F series contractor grade drill bits are manufactured from M1 High Speed Steel. For use in a wide range of materials in the iron and steel families such aluminum, iron, steel and other metal drilling. 135 degree split point tip for self-centering and reducing thrust. Compared to a conventional 118 degree tip, these drills wont go "walking" on you. 3-Flat shank creates an extra secure hold in your chuck. Common flute and overall length for minimal adjustment during tool changes 3" Flute Length, 6" Overall Length, 1/2" Shank.