Product description The AutoDelo drills are made of alloy cobalt tool steel R6M5K5 Cobalt 5%. The cobalt included in the composition of the steel allows it to maintain hardness at high temperatures, which is especially important when drilling difficult-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 of high hardness metals. - Hardness is 64-67 HRC. - Packed in an envelope with a hole for convenient storage. Using drills with increased wear resistance and hardness allows to significantly save time spent on drilling and simplifies the work of the car mechanic several times.