12 Pack Of 1/8-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits For Hard JOBBER LENGTH: 1/8-inch cutting diameter, 1-5/8-inch flute length, 2-3/4-inch overall length, 135 degree split point, straight shank MADE FROM HIGH-SPEED STEEL AND 5% COBALT: improve much higher heat resistance because of cobalt steel's high red hardness, provide strong durable performance compared to typical hss drill bits CAN BE REPEATEDLY SHARPENED AS NEEDED: cobalt drill bit's hardness is uniform throughout the entire material, so that can be repeatedly sharpened without damaging the cutting edge allowing it to drill more than hss drill bits APPLICATION: best used for drilling in hard metal, including stainless steel INCLUDE: 12 pieces of 1/8-inch cobalt drill bits with case