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Cobalt Letter Series Drill Bits Cobalt HSS Drills Letter Sizes M42CO - Cobalt HSS, Screw Machine Length, Heavy Duty, 135° Split Point Made of heat resistant cobalt. Performs well in limited access areas or where extra rigidity is required. Designed for drilling high alloy and work hardening materials.   Letter Diameter Decimal Equivalent Flute Length, Inch Overall Length, Inch Pkg Qty M42CO EDP # Price Pkg. Purchase Online A 0.234 1.9375 2.4375 12 46542301 $102.48 Buy Now B 0.238 1.3750 2.5000 12 46542302 $109.20 Buy Now C 0.242 1.3750 2.5000 12 46542303 $108.72 Buy Now D 0.246 1.3750 2.5000 12 46542304 $109.20 Buy Now E 0.250 1.3750 2.5000 12 46542305 $99.36 Buy Now F 0.257 1.4375 2.6250 12 46542306 $114.72 Buy Now G 0.261 1.4375 2.6250 12 46542307 $115.44 Buy Now H 0.266 1.5000 2.6875 12 46542308 $122.16 Buy Now I 0.272 1.5000 2.6875 12 46542309 $122.16 Buy Now J 0.277 1.5000 2.6875 12 46542310 $122.16 Buy Now K 0.281 1.5000 2.6875 12 46542311 $122.16 Buy Now L 0.290 1.5625 2.7500 12 46542312 $144.96 Buy Now M 0.295 1.5625 2.7500 12 46542313 $144.96 Buy Now N 0.302 1.6250 2.8125 12 46542314 $155.76 Buy Now O 0.316 1.6875 2.9375 6 46542315 $86.28 Buy Now P 0.323 1.6875 2.9375 6 46542316 $86.28 Buy Now Q 0.332 1.6875 3.0000 6 46542317 $93.12 Buy Now R 0.339 1.6875 3.0000 6 46542318 $93.12 Buy Now S 0.348 1.7500 3.0625 6 46542319 $116.04 Buy Now T 0.358 1.7500 3.0625 6 46542320 $116.04 Buy Now U 0.368 1.8125 3.1250 6 46542321 $116.04 Buy Now V 0.377 1.8750 3.2500 6 46542322 $128.64 Buy Now W 0.386 1.8750 3.2500 6 46542323 $128.64 Buy Now X 0.397 1.9375 3.3125 6 46542324 $128.64 Buy Now Y 0.404 1.9375 3.3125 6 46542325 $128.64 Buy Now Z 0.413 2.0000 3.3750 6 46542326 $147.60 Buy Now