PRO Metal HSS-G are made from premium high-speed steel and ground to ensure they are long-lasting and resistant to wear and heat. They have an impact-rated hex shank, which means you can transfer more power to the drill and work more efficiently. They are a great choice for construction workers and installers who need durable drill bits to drill in alloyed and unalloyed steel, non-ferrous metals, cast iron, plastics, and wood.