Description

HSS stands for High Speed Steel and is commonly used to make drill bits for metal (before its invention, metal would typically be machined at low speeds to avoid wearing out the tooling).

Likewise, jigsaw blades made from HSS are more often than not designed for metal as well. While HSS teeth can withstand repeated cuts through tougher materials, the metal itself is quite stiff and inflexible, meaning that bends and curves can cause it to break prematurely.