Milling cutter: Negative rake angle, large-core design for sharpness, stability, chip removal, and efficiency. 45?a spiral angle reduces burrs, and enhances durability. Ample chip removal space for precision, shiny products. High-speed steel for toughness, wear resistance, and high-speed cutting. Ideal for CNC, milling, and drill machines; mills copper, aluminum, tool steel, cast iron, molds, wood, steel, stainless steel, alloy steel, carbon steel, die steel, titanium, aluminum, and more. 8pcs CNC Square Nose End Mill Bits: HSS material, great toughness, hardness, and speed cutting 4 flutes sharp edge, wear resistance at high cutting speeds 45?a spiral angle design for side milling, end milling, finish machining, etc Apply to material in wood, steel, stainless steel, alloy steel, carbon steel, etc Perfect for CNC data machine, milling machine, drill machine to milling copper, etc Package Includes: 8 x Milling Cutters