ITEM NAME:2 Pieces 8mm Shank CNC Router Bottom Cleaning Bit Milling Cutter Woodworking Description: Using for hand-making or woodworking Industrial Quality Router Bits The is made of high quality tungsten steel alloy forging , 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.Using for hand-making or woodworking. Shank Diamter: 8mm( 5/16"). Baked on heat resistant coating prevents build-up of sawdust, resin, and pitch. Build-up & Heat Resistant Coating. The is made of high quality tungsten steel alloy forging, body is made of titanium steel material(HSS).