ITEM NAME:2pcs Carbide Tipped Cleaning Bottom Router Bit Cutter 5mm 10mm Cutting Dia, 8mm Description: Router CNC Engraving Wood Working Bottom Cleaning Bit - 8mm/ 0.315in Shank - 5mm/10mm Cutting Diameter. Industrial grade micro grain car.Size(Approx.). Mainly used for cutting and smoothing a variety of materials from wood, plywood, MDF and other wood composites etc. Build-up & heat resistant polytef coating, anti-kickback design. Color: Black.