Product description AVTODELO drills are made of alloyed cobalt tool steel R6M5K5 Cobalt 5%. The 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 drills' tips are sharpened in a cross shape at an angle of 135°, which allows drilling highly hardened metals. - Hardness 64-67 HRC. - Packed in an envelope with a hole for convenient storage. Using drills with high wear resistance and hardness allows significantly saving the time spent on drilling and greatly simplifies the work of the car mechanic.