ITEM NAME:2 Pieces 8mm Cleaning Bottom Engraving Bit Solid Carbide Router Bit Woodworking Description: Router CNC Engraving Wood Working Bottom Cleaning Bit - 8mm/ 0.315in Shank - 5mm/18mm Cutting Diameter. Industrial grade micro grain car.Size(Approx.). Build-up & heat resistant polytef coating, anti-kickback design. The color may have different as the difference display, pls understand. Color: Black.