Ultra Bit  Multi -Diameter 3-Flats on Shank.

Special Axial and Radial flute design increases work piece penetration.  Dual flute construction drills clean accurate holes in thin materials, quickly and easily.  Use for all thin metals, rigid plastics, wood or composite materials with a thickness equal to or less than the step thickness. Split point self centers and easily starts with no pilot hole required. Made in the U.S.A.

Sizes: 

•  1/8" - 1/2"
•  3/16" - 1/2"
•  1/4" - 3/4"