ITEM NAME:2 Pieces 8x10mm Router CNC Engraving Woodworking V Groove Bottom Bit Description: Using for hand-making or woodworking Industrial Quality Router Bits,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). Material: Tungsten steel alloy. Shank Diamter: 8mm( 5/16").