ITEM NAME:2 Pieces Professional CNC Router Bit Tungsten Carbide End Mill Cutter Bit - 8mm Description: Using for hand-making or woodworking Industrial Quality Router Bits,Industrial grade micro grain car.The is made of high quality tungsten steel alloy forging, body is made of titanium steel material(HSS). Material: Tungsten steel alloy. Shank Diamter: 8mm( 5/16"). Baked on heat resistant coating prevents build-up of sawdust, resin, and pitch.