Product description AUTO-DELLO drills are made of alloyed cobalt tool steel Р6М5К5 Cobalt 5%. Cobalt, which is part of the steel, allows maintaining hardness at high temperatures, which is especially important when drilling hard-to-machine stainless steels. - Have high wear resistance. - The tip of the drills is sharpened crosswise at an angle of 135°, 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 saving a significant amount of time spent on drilling and greatly simplifies the work of automotive craftsmen.