Dewalt dt7942b extreme hss cobalt drill bit 1 5 7mm set of 13 dewalt dt7942 qz this 13 piece cobalt drill bit set from dewalt features right hand cutting helix type n flute with 5 cobalt alloyed high speed steel for stability at high temperatures when drilling arduous materials the unique cobalt tip improves efficiency and eliminates walking manufactured to din 338 br br included in the set br br extreme dewalt cobalt bits sizes 1 5 2 2 5 3 3 2 3 5 4 4 5 5 5 5 6 6 5