18.50 MM METRIC, HIGH SPEED STEEL, JOBBER LENGTH, DRILL BIT. DECIMAL EQUIVALENT .7283 FLUTE LENGTH 149MM OVERALL LENGTH 198MM 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.