High-speed steel (HSS or HS) is a subset of tool steels, commonly used as cutting tool material. It is often used in power-saw blades and drill bits. It is superior to the older high-carbon steel tools used extensively through the 1940s in that it can withstand higher temperatures without losing its temper (hardness).
M2 high speed steel HSS Tool Bits are designed for general purpose machining mild steel, alloys, and tool steels. They have good heat and abrasion resistant properties and are best used when making an. interrupted cut or where the tool may be subjected to heavy load or shock.