One drill bit for virtually every metal drilling application. The Diablo Metal Demon™ 15-Piece Drill Bit Set is engineered to drill mild steel, hardened steel, stainless steel, cast iron, sheet metal, and more with exceptional speed, durability, and precision. Featuring Diablo's exclusive Thermal Shield Protective Coating™ and precision-ground 130° Hybrid Split Point tips, these bits start fast, stay sharp, and deliver dramatically longer life than conventional titanium, cobalt, or black oxide drill bits.