Comparison : Item # CTD25500, M14 S&D Magnum Super Premium Drill Bit- 1/2" Shank 3-Flats
Item # CTD25502, M15 S&D Magnum Super Premium Drill Bit- 1/2" Shank 3-Flats
Item # CTD25504, M16 S&D Magnum Super Premium Drill Bit- 1/2" Shank 3-Flats
Item # CTD25510, M17 S&D Magnum Super Premium Drill Bit- 1/2" Shank 3-Flats
Item # CTD25512, M18 S&D Magnum Super Premium Drill Bit- 1/2" Shank 3-Flats