Countersink drill bits, end mills, 5-piece HSS step countersink drill bit set, metal countersink drill bits, M3-M8 slot drill bit set, 4-flute cutting drill bit for copper, aluminum and steel

General Description: This countersink and end mill set is a 5-piece set designed to increase efficiency and reduce machining time. Its design allows for quick tool changes and optimized machine movements, essential for milling materials such as copper, aluminum, and steel. Ideal for DIY projects and everyday use, this set enables easy and efficient drilling without burr formation. Technical Specifications: Hardness: HRC 65–68°; Cutter Sizes: M3: 3.2 x 5.9 x 6 x 45 mm; M4: 4.2 x 7.4 x 6 x 48 mm; M5: 5.2 x 8.9 x 6 x 51 mm; M6: 6.2 x 10.4 x 8 x 58 mm; M8: 8.2 x 13.4 x 12 x 67 mm; Material: Ultra-hard HSS-AL high-speed steel; Application: End mills are specifically designed for milling various materials such as copper, aluminum, steel, and cast iron. They are ideal for precision and finishing work and allow for the direct machining or fine-tuning of heat-treated molds.