This is no ordinary holesaw. It is built for speed and durability and designed specifically for drilling in sheet steel up to 1.6mm thick. The slim kerf of 0.6mm reduces resistance and the HSS cutting edge of 8tpi makes for a fast and smooth drilling action. The cutting edge has an 8% cobalt content for extra durability and the standard 1/4" hex shank is impact resistant, enabling you to use them in an impact driver. A flared depth stop means you will not push the holesaw right through and the internal ejection spring makes for hassle-free fast drilling.