These BAUER™ Index Drill Bits are made from precision-machined hardened high-speed steel with a durable titanium coating for improved performance and up to 5X longer bit life.* The full assortment bit set is great for drilling through wood, mild steel, aluminum, brass, and plastic. The set includes bit sizes 1/16 in. to 1/2 in. in 1/64 in. increments.