Because the inserts are triangular, adjacent corners 37 of {HEAD ~ the inserts} may be positioned very close together, and yet a thick section of drill body 13 may be located between {TAIL ~ the inserts} near the corners 37 so as to impart strength to the drill shank even with such high length to diameter ratios 
Because the inserts are triangular , adjacent corners 37 of { HEAD ~ the inserts } may be positioned very close together , and yet a thick section of drill body 13 may be located between { TAIL ~ the inserts } near the corners 37 so as to impart strength to the drill shank even with such high length to diameter ratios
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