INDIVIDUAL DRILL BIT, LETTER SIZE F, JOBBER LENGTH, KILLER FORCE DRILL . DECIMAL EQUIVALENT .2570 FLUTE LENGTH 2-7/8" OVERALL LENGTH 4-1/8". 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.