ITEM NAME:2 Pieces 8mm Router CNC Engraving Woodworking V Groove Bottom Cleaning Bit 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. The is made of high quality tungsten steel alloy forging, body is made of titanium steel material(HSS). Shank Diamter: 8mm( 5/16"). Material: Tungsten steel alloy.