The ideal drill set for the demanding professional profile ground spiral drill hss gk with cross cut features din 338 type n right bright quality cross cut to din 1412 c for drills with a very strong core for particularly tough and hard materials and for downhole drills good centering low feed force required improved transportation by means of chip division 1 10 mm diameter increasing by 05 mm above 2 mm the drills are cross cut 19 pcs hss drill bits in unbreakable beautiful plastic