Product description AVTODELO drills are made of alloyed cobalt tool steel Р6М5К5 Cobalt 5%. The cobalt included in the steel composition allows maintaining 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 cross-shaped sharpened at an angle of 135°, which allows drilling high hardness metals. - Hardness: 64-67 HRC. - They are packed in an envelope with a hole for convenient storage. Using drills with increased wear resistance and hardness allows saving a significant amount of time spent on drilling and simplifies the work of the car mechanic several times.