Bahco 9629-SET-8 Flat Drill Bit Set for Wood (8 Piece) The Bahco 9629-SET-8 is an 8 piece flat drill bit set with a range from 12mm to 32mm. They all have 1/4 inch / 6.35mm shanks and are made from heat-treated high carbon steel.  Features: Flat bit drill for wood Quick-change hex shank 6.35 mm High-carbon steel, heat-treated overall Hardened blade forged directly from the round shaft Lacquered for rust protection Flat bit with positive cutting angle for faster drilling than with conventional bits Contains: 8 x Drill bits in sizes: 12 - 16 - 18 - 20 - 22 - 25 - 28 - 32mm