Precision ground from M35 high speed steel bars with 5% cobalt, these drill bits are designed for alloys, hardened steels, cast irons, titanium, and other hard-to-drill materials. They feature a 135° split point to prevent walkaround and have a fully ground amber finish, manufactured to DIN338 standards. Always use a cooling agent when drilling. These are a 2-pack of 5.5mm drill bits.