Product description AVTODELO drills are made of alloyed cobalt tool steel Р6М5К5 Cobalt 5%. 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 tips of the drills are cross-ground at a 135° angle, which allows drilling high-hardness metals. - Hardness: 64-67 HRC. - Packed in an envelope with a hole for convenient storage. Using drills with increased wear resistance and hardness allows significantly saving the time spent on drilling and greatly simplifies the work of the car mechanic.