General description Special 4-cutting edge design cutter, typically mounted on milling machines. These high-speed steel (HSS) drill bits are engineered for high toughness and abrasion resistance, making them ideal for high-speed cutting of various materials. Technical specifications Sizes: 4mm, 6mm, 8mm, 10mm, 12mm Material: High Speed Steel (HSS) Flutes: 4 Usage Suitable for cutting a variety of materials, including: Steel Wrought iron Carbon steel Alloy steel Shear tool steel General iron material