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Taper Length Core Drill Bits - Straight Shank High Speed Steel Drills Fractional Sizes SS400 - HSS, Core, Straight Shank, 4 Flute, Surface Treated, 118° Chamfer Used to size or enlarge cored, punched or other pre formed holes; not designed to drill from solid. Operates at heavier feeds than 2 flute drills since chiploads are spread over a greater number of cutting edges. Reduce regular drill speed 25% and double the feed rate.                                                                                                                                                        Package quantities; 3/8 to 1/2 - 1 per envelope, 17/32 to 1 - 1 per tube, 1-1/32 to 1-1/2 - 1 per box Diameter, Inch Flute Length, Inch Overall Length, Inch Price Pkg. SS400 EDP # Purchase Online 0.2500 3.750 6.125 $65.76 46054016 Buy Now 0.2812 3.875 6.250 $69.56 46054018 Buy Now 0.3125 4.000 6.375 $70.72 46054020 Buy Now 0.3438 4.125 6.500 $75.44 46054022 Buy Now 0.3750 4.250 6.750 $77.62 46054024 Buy Now 0.4062 4.375 7.000 $85.18 46054026 Buy Now 0.4375 4.625 7.250 $85.10 46054028 Buy Now 0.4688 4.750 7.500 $95.24 46054030 Buy Now 0.5000 4.750 7.750 $97.32 46054032 Buy Now 0.5310 4.750 8.000 $101.96 46054034 Buy Now 0.5625 4.875 8.250 $107.34 46054036 Buy Now 0.5938 4.875 8.750 $128.96 46054038 Buy Now 0.6250 4.875 8.750 $136.56 46054040 Buy Now 0.6562 5.125 9.000 $146.26 46054042 Buy Now 0.6875 5.375 9.250 $156.46 46054044 Buy Now