Overview Reviews Product Description Engineered to take on the most demanding drilling jobs, this 3 pc. UnibitĀ® cobalt hss step drill bit set will be a go-to in any tradesman's tool box.With an m-35 cobalt alloy high-speed steel construction, these bits are made to power through heavy-duty materials, like stainless steel.The single-flute design allows for precision drilling of true round holes.Includes 3 bits #2 and #3 sizes feature a speedpoint tip for fast starts. Irwin Tools Catalog Product Videos Custom Field Manufacturing country US Product Reviews Write a Review Write a Review × Irwin 3 Pc. Cobalt Alloy Steel Step Drill Bit Set 10502CB Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *