Product description AVTODELO drills are made of alloyed cobalt tool steel R6M5K5 Cobalt 5%. The cobalt content in 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 tips of the drills are sharpened crosswise at an angle of 135°, which allows drilling of highly hard metals. - Hardness of 64-67 HRC. - Packaged in an envelope with a hole for convenient storage. The use of drills with increased wear resistance and hardness allows for significant time savings in drilling operations and significantly simplifies the work of the automotive mechanic.