Product description AutoDelo drills are made of alloyed cobalt tool steel R6M5K5 Cobalt 5%. The cobalt included in the steel composition allows to maintain hardness at high temperatures, which is especially important when drilling hard-to-machine stainless steels. - They have high wear resistance. - The tip of the drills is sharpened in a cross shape at an angle of 135°, which allows drilling of high hardness metals. - Hardness: 64-67 HRC. - Packaged in an envelope with a hole for convenient storage. Using drills with increased wear resistance and hardness significantly saves the time spent on drilling and simplifies the work of the car mechanic several times.