THIS IS A 29 PIECE DRILL BIT SET CONTAINING SIZE 1/16 -1/2 INCH. THESE SETS ARE MANUFACTURED TO NATIONAL AEROSPACE STANDARD. IT IS MADE OF HEAT RESISTANT COBALT WHICH HAS HIGHER RED HARDNESS THAT ALLOWS IT TO PERMIT SPEEDS UP TO 30% GREATER THAN HIGH SPEED DRILLS. ITS DESIGN TO PENETRATE TOUGH HIGH TENSILE MATERIALS LIKE PH STAINLESS, INCONEL, AND TITANIUM. THE BITS HAVE 135 DEGREE SPLIT POINT AND SELF- CENTERING TECHNOLOGY. THEY COME IN A HUOT CASE. THIS SET ARE 100% AMERICAN MADE. IF YOU HAVE ANY QUESTIONS, FEEL FREE TO ASK.
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