Product description AUTODELO drills are made of cobalt alloyed tool steel P6M5K5 Cobalt 5%. The cobalt included in the composition of the steel allows it to maintain hardness at high temperatures, which is particularly important when drilling difficult-to-machine stainless steels. - They 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. - Packaged in an envelope with a hole for convenient storage. The use of high-wear-resistant and hard drills allows to significantly save the time spent on drilling and greatly simplifies the work of the car mechanic.