• The speed helix design penetrates 3X faster than standard bits. The benefits include easier drilling reduced heat extended drill bit life and extended cordless battery life


• Triple tempered black oxide coated bits last 50-Percent longer than regular high speed steel and offer reduced friction between bit and work piece


• 135-Degree split point starts on contact with no walking or skating and no center punch is required


• Jobbers length bits in wire gauge sizes no.1 through no.60

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Eh?

If your buying this for big tough projects this isnt the set you want. Its more of a household set for household projects. I used this set to modify my quad trailor and all the big bits either got dull after one use or they chipped and as far as the small ones go there alright but brake quite fast.More detail ...