HSS Stepped Conical Drill Bit - 4-42 mm - 14 Sizes - High-Speed Steel Round Shank Hole Cutting Tool

High-quality material: High-speed steel. Deburring function: Automatically deburrs holes when drilling. Surface treatment: Nitrogen-treated to increase hardness and abrasion resistance. Scope of application: Thin iron plate, aluminum, insulation panels, 4mm thick PVC panels in wood. Step type: 14 sizes, 4-42mm (4, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42mm) Main features: Nitrogen-treated to increase hardness and abrasion resistance. Automatically deburrs holes when drilling. Made of high-speed steel, durable and long-lasting. 14 sizes, 4-42mm (4, 6, 9, 12, 15, 18, 21, 24, 27, (30, 33, 36, 39, 42 mm) Widely used for cutting holes in a variety of materials such as steel, wood, thin iron, aluminum alloy, insulation panels, PVC sheet, etc. Package contents: 1 x 4-42 mm HSS steel cone drill bit.