Product description AVTODELO Drills are made of alloyed cobalt tool steel R6M5K5 Cobalt 5%. The cobalt included in the steel composition allows for maintaining hardness at high temperatures, which is particularly important when drilling hard-to-machine stainless steels. - They have high wear resistance. - The tips of the drills are sharpened in a cross shape 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 high wear-resistant and hard drills can significantly save the time spent on drilling and simplify the work of the car mechanic several times.