A HSS drill bit is a type of metal drill bit that is made of high-speed steel, a material that is tough and resistant to heat. HSS drill bits are capable of drilling through several types of metals, plastic, and hardwood. They are safe to operate at high speeds (RPM) and provide long-lasting performance, as long as they are maintained. HSS drill bits are generally cheaper than other types of drill bits. Over time, HSS drill bits can become blunt and need to be sharpened, which demands specialist tools that aren’t always available. If you’re using HSS drill bits for long periods or at high RPMs, you may need to use cutting fluid to keep the bit cool.