Product Description AVTODELO drills are made of alloyed cobalt tool steel R6M5K5 Cobalt 5%. Cobalt included in the steel composition allows maintaining hardness at high temperatures, which is especially 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 of 64-67 HRC. - Packed in an envelope with a hole for convenient storage. Using drills with increased wear resistance and hardness significantly saves the time spent on drilling and simplifies the work of the car mechanic several times.