Product description Autodelo 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 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 drills with increased wear resistance and hardness allows saving a significant amount of time spent on drilling and simplifies the work of the car mechanic multiple times.