Product Description AVTODELO Drills are made from alloyed cobalt tool steel R6M5K5 Cobalt 5%. The cobalt in the steel composition allows for maintaining hardness at high temperatures, which is particularly 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 for drilling high-hardness metals. - Hardness is 64-67 HRC. - They are packed in envelopes with holes for convenient storage. Using drills with increased wear resistance and hardness allows for significant time savings in drilling and greatly simplifies the work for the car mechanic.