Product Description AUTO-DELO drills are made of cobalt alloy 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 drill tip is cross-shaped sharpened 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 allows significantly saving time spent on drilling and simplifies the work for the car mechanic multiple times.