Drill fi 7.8 mm HSS Co.

Professional cobalt drill bit for metal HSS-Co fi 7,8 mm bulk pack of 10 pcs. CNC PROFI HSS-Co drills are drills, the highest quality, which are made of high-speed steel HSS Co with 5% cobalt and contains chromium, molybdenum,which increases the strength of the drill bit to wear and high temperatures. The drill has a hardness of 64 HRC and retains it at high temperatures . Professional cobalt drill bits are recommended for hard acid-resistant steel and hard-to-cut steels .