INDIVIDUAL DRILL BIT, LETTER SIZE N, JOBBER LENGTH, KILLER FORCE DRILL . DECIMAL EQUIVALENT .3020 FLUTE LENGTH 3-1/16" OVERALL LENGTH 4-3/8". MANUFACTURED FROM PREMIUM GRADE HIGH SPEED STEEL, KILLER FORCE DRILLS HAVE A HEAVY DUTY 135 DEGREE SPLIT POINT FOR SELF CENTERING AND REDUCING THRUST. GOLD AND BLACK SURFACE TREATED FOR USE IN STAINLESS STEEL AND OTHER HARD METAL DRILLING. OUR BEST SELLER. A GREAT DRILL FOR A GOOD PRICE. THEY DRILL LIKE A BASTARD.