C1083100 - Countersinks 90 Three Flute DIN - Three Flute Countersink 90, DIN 335, UNI - Countersinking / Counter boring screw holes for Countersunk screws acc. to DIN 963, 964, 965, 966, 7513, 7516 - For Countersunk screws acc. to ISO 2009, 2010, 7046-1, 7046-2, 7047 - Chamfering of tapping holes - For use in machine applications. Type N - For non-ferrous, Type UNI - For difficult to machine materials Diameter of Head 31mm Shank 12mm Length 71mm