Ougar8 4 5 6 8mm CNC Carbide Milling Cutter 4 Flutes Tungsten Carbide TiAlN Coated Square Flat End mill Endmills Spiral Micrograin solid Router bits HRC55(4pcs/Lot) 1.Material: Tungsten carbide. 2.Center Cutting HRA92,4 Flutes.Max Cutting material hardness:HRC55 3.Coating witn TiAlN Can Cutting Harden materiel, 3 times Durable than Carbide. 4.For CNC,Drill press,Engraving machine.Aluminium,Metel,wookworking,alloy steel,stainless steel,etc 5.Package: 4x End Mill Cutter CNC Bits