1.55MM METRIC, HIGH SPEED STEEL, JOBBER LENGTH, DRILL BIT. DECIMAL EQUIVALENT- .0610 FLUTE LENGTH- 22MM OVERALL LENGTH- 43MM A DEPENDABLE, GENERAL PURPOSE DRILL DESIGNED TO PERFORM IN A BROAD RANGE OF MATERIALS IN THE IRON AND STEEL FAMILIES. IDEAL FOR PRODUCTION, MAINTENANCE OR PORTABLE DRILLING JOBS. SURFACE TREATED WITH ABRASION -RESISTANT BLACK OXIDE.