Set of Conical Drill Bits made of HSS combined with a titanium coating to make them even more durable. Drill stepped every 2 mm with cylindrical handles and legible numbering. Ideal for metals, thin-walled steel sheets, plastics. A well-organized box provides users with easy storage and transport. Technical Data: Application: metal, thin-walled steel sheets, plastics Drill Size: 4-12mm, 4-20mm, 4-32mm, 4-39mm Gradation: 2 mm Handle: cylindrical Material: HSS Steel coated with Titanium