Product description The AVTODELO drills are made of Cobalt 5% alloy tool steel R6M5K5 Cobalt 5%. Cobalt in the composition of the steel allows for maintaining 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 for drilling high hardness metals. - Hardness 64-67 HRC. - Packed in a envelope with a hole for storage convenience. Using drills with increased wear resistance and hardness significantly saves the time spent on drilling and simplifies the work of the car master several times.