If you want to drill in metal or sheet material, don't forget to attach a metal drill to your drill. Metal drills are very sharp, so they can drill through the hard material. You could slip if it wasn't sharp and of course you don't want to damage the metal. The most common metal drill bit is often called HSS drill, after High Speed Steel. Often, you'll find metal drills in a set with wood and stone drills, because they can all be used with your screw or impact drill.