Multi-piece titanium-coated high-speed steel (HSS) step drill bit set housed in a portable blue and white plastic storage case, including cone-shaped step cutters, standard twist/saw drill bits, and a center punch tool.Set Contents & FeaturesStep Drill Bits: Large conical bits featuring graduated step sizes (such as 4-12mm and 4-32mm ranges) used for clean hole-enlarging in sheet metal, plastic, or wood.Auxiliary Bits: Includes smaller pilot or twist saw drill bits for versatile drilling tasks.Material & Coating: High-speed steel construction with a titanium nitride coating to reduce friction and heat buildup during cutting.