16mm Dia 45-Degree Silver HSS Double-edged Dovetail Cutter Metalworking End Mill 8 Flutes HSS material, durable and long service life. Blade diameter: 16mm/0.63'' , Shank Diameter: 10mm/0.39'' Safety instructions: Razor blades permanently enclosed in a cartridge or housing with less than 2mm of blade exposed. The bladed product is not use for people under 18 years. The item is only use for industrial cutting/engraving, not hazardous article. It is double-edged with regualr distribution,8 flutes making the the cutting stable. It fits for meatalworking mold steel, cast iron, carbon steel, alloy steel, tool steel, general iron material.