HSS 4241 Round Shank Unibit Double Spiral Flute Step Tapered Drill Bit Set for Metal Drilling

Feature:

• Forged from high-quality titanium coated high-speed steel
• Suitable for drilling thinner stainless steel, carbon steel, aluminum, iron, and other materials
• The step drill bit sets have a clear scale mark
• Universal round shank
• Step drill bits can drill different kinds of diameter holes, which greatly saves you a lot of trouble