INDIVIDUAL DRILL BIT, LETTER SIZE X, JOBBER LENGTH, KILLER FORCE DRILL . DECIMAL EQUIVALENT .3970 FLUTE LENGTGH 3-3/4" OVERALL LENGTH 5-1/8". 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.