They are black and gold surface treated.
Reduced Shank Drills expand the size range capacity of a portable drill chuck. Contractor grade drill bit manufactured from M1 High Speed Steel and for use in a wide range of materials in the iron and steel families such aluminum, iron, steel and other metal drilling. 3-Flat shank for an extra secure hold in your chuck.Contractor Drill Bits have a 135 degree split point tip for self-centering and reducing thrust.