COBALT DRILL BIT 7/64in. OVERALL LENGTH 2-5/8in. - DRILL BITS COBALT. COBALT DRILLS ARE DESIGNED TO CUT THROUGH EXTREMELY HARD METALS INCLUDING STAINLESS STEEL. NO CENTER PUNCH NEEDED: CENTURY 135 DEGREE QUICK-CUT POINTS ARE SELF-CENTERING AND PENETRATE FASTER WITH LESS PRESSURE WILL NOT WALK OR WANDER AT THE STARTING SURFACE. EXTREMELY HEAT RESISTANT MUST BE USED AND OPERATED IN POWER UNITS THAT HAVE A RPM SPEED OF 1.500 OR MORE FOR MAXIMUM EFFICIENCY. AEROSPACE NAS 907-J SPECIFICATIONS. 12X LIFE RATING COMPARISON TO THE AVERAGE 118 DEGREE POINT HIGH SPEED STEEL DRILL.
