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Taper Length Cobalt Drill Bits Cobalt HSS Drill Bits, Heavy Duty Wire Sizes QC91CO - Cobalt HSS, Wide Land Parabolic Flute Design, Bronze Color Oxide, 135° Split Point Especially effective in deep hole drilling; unique flute form produces closer tolerances due to improved chip and coolant flow and higher torsional rigidity. 135° self centering split point reduces thrust. Taper length (longer flute and overall length) improves reach and deep hole drilling capability. Used for drilling high alloy steels, titanium, Inconel, PH stainless and other difficult to machine materials.   Wire Diameter Size Decimal Equivalent Flute Length, Inch Overall Length, Inch Pkg Qty Price Pkg. QC91CO EDP # Purchase Online 1 0.2280 3.750 6.125 12 $662.40 46553901 Buy Now 2 0.2210 3.750 6.125 12 $662.40 46553902 Buy Now 3 0.2130 3.625 6.000 12 $662.40 46553903 Buy Now 4 0.2090 3.625 6.000 12 $662.40 46553904 Buy Now 5 0.2055 3.625 6.000 12 $662.40 46553905 Buy Now 6 0.2040 3.625 6.000 12 $662.40 46553906 Buy Now 7 0.2010 3.625 6.000 12 $622.32 46553907 Buy Now 8 0.1990 3.625 6.000 12 $622.32 46553908 Buy Now 9 0.1960 3.625 6.000 12 $622.32 46553909 Buy Now 10 0.1935 3.625 6.000 12 $622.32 46553910 Buy Now 11 0.1910 3.625 6.000 12 $622.32 46553911 Buy Now 12 0.1890 3.625 6.000 12 $622.32 46553912 Buy Now 13 0.1850 3.375 5.750 12 $546.48 46553913 Buy Now 14 0.1820 3.375 5.750 12 $546.48 46553914 Buy Now 15 0.1800 3.375 5.750 12 $546.48 46553915 Buy Now 16 0.1770 3.375 5.750 12 $546.48 46553916 Buy Now 17 0.1730 3.375 5.750 12 $546.48 46553917 Buy Now 18 0.1695 3.375 5.750 12 $546.48 46553918 Buy Now 19 0.1660 3.375 5.750 12 $546.48 46553919 Buy Now 20 0.1610 3.375 5.750 12 $546.48 46553920 Buy Now 21 0.1590 3.375 5.750 12 $464.64 46553921 Buy Now 22 0.1570 3.375 5.750 12 $468.96 46553922 Buy Now 23 0.1540 3.000 5.375 12 $462.48 46553923 Buy Now 24 0.1520 3.000 5.375 12 $468.96 46553924 Buy Now 25 0.1495 3.000 5.375 12 $468.96 46553925 Buy Now 26 0.1470 3.000 5.375 12 $468.96 46553926 Buy Now 27 0.1440 3.000 5.375 12 $468.96 46553927 Buy Now 28 0.1405 3.000 5.375 12 $468.96 46553928 Buy Now 29 0.1360 3.000 5.375 12 $468.96 46553929 Buy Now 30 0.1285 3.000 5.375 12 $468.96 46553930 Buy Now 31 0.1200 2.750 5.125 12 $377.04 46553931 Buy Now 32 0.1160 2.750 5.125 12 $380.64 46553932 Buy Now 33 0.1130 2.750 5.125 12 $384.24 46553933 Buy Now 34 0.1110 2.750 5.125 12 $384.24 46553934 Buy Now 35 0.1100 2.750 5.125 12 $384.24 46553935 Buy Now 36 0.1065 2.500 4.625 12 $374.88 46553936 Buy Now 37 0.1040 2.500 4.625 12 $374.88 46553937 Buy Now 38 0.1015 2.500 4.625 12 $374.88 46553938 Buy Now 39 0.0995 2.500 4.625 12 $364.08 46553939 Buy Now 40 0.0980 2.500 4.625 12 $374.88 46553940 Buy Now 41 0.0960 2.500 4.625 12 $374.88 46553941 Buy Now 42 0.0935 2.250 4.250 12 $298.56 46553942 Buy Now 43 0.0890 2.250 4.250 12 $294.48 46553943 Buy Now 44 0.0860 2.250 4.250 12 $291.36 46553944 Buy Now 45 0.0820 2.250 4.250 12 $298.56 46553945 Buy Now 46 0.0810 2.250 4.250 12 $298.56 46553946 Buy Now 47 0.0785 2.250 4.250 12 $298.56 46553947 Buy Now 48 0.0760 2.000 3.750 12 $249.12 46553948 Buy Now 49 0.0730 2.000 3.750 12 $249.12 46553949 Buy Now 50 0.0700 2.000 3.750 12 $249.12 46553950 Buy Now 51 0.0670 2.000 3.750 12 $249.12 46553951 Buy Now 52 0.0635 2.000 3.750 12 $242.16 46553952 Buy Now