ITEM NAME:2pcs 8mm Shank Bottom Cleaning Straight/ Dado Router Bit 6mm 18mm Wood Cutting Description: Router CNC Engraving Wood Working Bottom Cleaning Bit - 8mm/ 0.315in Shank -6mm/ 18mm 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. The color may have different as the difference display, pls understand.