INDIVIDUAL DRILL BIT, LETTER SIZE Y, JOBBER LENGTH, KILLER FORCE DRILL . DECIMAL EQUIVALENT .4040 FLUTE LENGTGH 3-7/8" OVERALL LENGTH 5-1/4". 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.