ITEM NAME:2pcs 8mm Shank CNC Router Bit Tungsten Carbide 1/4" Flush Trim Router Description: The is made of high quality tungsten steel alloy forging , body is made of HSS Build-up & Heat Resistant Coating,Industrial grade micro grain car.The is made of high quality tungsten steel alloy forging, body is made of HSS. Baked on heat resistant coating prevents build-up of sawdust, resin, and pitch.