TUNGSTEN CARBIDE: These cutters are made of high quality tungsten carbide for good hardness,so these cutters have a sharp edge. POLISHED AND COATED SURFACE: These cutters adopted well-polished coated surfaces,have better anti-rust performance,the surface is clean,neat,and there are no problems or burrs on the shank. /p> SHARP: Sharp cutting edges,can be used to countersink holes,grooves and edges on plates,you will have a clean and smooth cut. FIT FOR MANY MACHINES: These 3.175mm end mills were designed for many milling or CNC cutting machines. HANDEL DIFFERENT HARDWARE: These cutters can be used to drill many items or materials can be engraved such as circuit boards,hardware parts,plastics,copper and stainless steel. Features: Material: Tungsten carbide steel Type: 2-flute milling cutter Surface finish: titanium coating Set of ten 0.80-3.175MM (0.8-1.0-1.2-1.5-1.6-1.8-2.0-2.4-2.5-3.0)