The dewalt 13 piece extreme hss metric cobalt drill bit set ideal for the professional user 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 extreme cobalt tip improves efficiency and eliminates walking manufactured to din 338 supplied in a small tough case contains sizes 15 2 25 3 32 35 4 45 5 55 6 65 and 7mm