Engineered for precision and durability, this 19-piece HSS Cobalt Drill Bit Set is ideal for tackling tough materials like stainless steel and high-alloy steels. Whether you're a professional tradesperson or a serious DIYer, this set delivers exceptional performance and long-lasting reliability. The ideal drill bit set for V2A Nirosta®, V4A, CrNi steel and special alloys. Tungsten-molybdenum steel with 5% cobalt for durability.