ITEM NAME:3.175mm Carbide Tungsten Corn Cutter cutting PCB milling bits CNC router bits Z a.imagelink a:hover.imagelink {color:#db3606;.1pcs Tungsten Corn end mill. Suitable for processing: PCB, Mould, plasti, carbon fiber, composite board, hard wood. and so on. Material: Tungsten steel. Made of Tungsten steel high construction tools.