21/64 x 12" Cobalt Aircraft Extension Drill Bit 6" Cobalt Aircraft Fractional Drills They have a 1/4" Hex

They have a 1/4" Hex Shank that can be used in quick change impact drivers

it runs up to 30% faster than standard M2 high speed steel

Sold in packs of 6

Our M35 cobalt drills are designed for easy drilling through the toughest materials

The drill bit has a round shank that works with a wide range of tool holding systems

21/64 x 12" Cobalt Aircraft Extension Drill Bit 6" Cobalt Aircraft Fractional Drills They have a 1/4" HexDescription The M35 Cobalt Drill Bit is an extra long drill bit designed for drilling tough materials like stainless steel, inconel, and titanium. It has a 135 split point tip for fast and accurate drilling and is manufactured to Aerospace Standard 907 for superior quality. The drill bit has a round shank that works with a wide range of tool holding systems. It displays high red hardness, allowing for speeds up to 30% faster than conventional M2 high