Drill bits made of high-speed steel (HSS) can be used to drill wood, fiberglass, polyvinyl chloride (PVC), and soft metals like aluminum. Cobalt drill bits are highly hard and quickly disperse heat. The other types of steel drill bits are less hard but hold their shape well during drilling. Aluminum is a lightweight metal that is used in many products around the home for its characteristic bright color and ease of shaping. However, it is very brittle and will not withstand heavy loads without breaking. Like other metals, aluminum can be drilled with a drill bit, but because of its weight and tendency to bend when you push it down into the surface, you need a special tool called an aluminum drill. The most common method of drilling holes in aluminum is with a hand-held electric or air-powered drill. These drills are easy to use and relatively inexpensive. They usually have nylon or stainless steel blades which cut better than carbide blades do when working with aluminum. Avoid using wooden drill bits with electric drills as they will conduct electricity and cause a short circuit. When you drill holes in aluminum, wear protective clothing and equipment. Aluminium is toxic if inhaled or ingested so take all precautions necessary to prevent any contact with your skin.