ITEM NAME:Cleaning Bottom Router Bit Tipped Carbide CNC Engraving Bottom Cleaning Bit Description: Using for hand-making or woodworking Industrial Quality Router Bits The blade is made of high quality tungsten steel alloy forging blade, body is made of titanium steel material(HSS) Build-up & Heat Resistant Coating Baked on heat resistant coating prevents build-up of sawdust, resin, and pitch. Industrial grade micro grain car.Shank Diamter: 8mm( 5/16"). The blade is made of high quality tungsten steel alloy forging blade, body is made of titanium steel material(HSS). Build-up & Heat Resistant Coating. Baked on heat resistant coating prevents build-up of sawdust, resin, and pitch.