Description: Router CNC Engraving Wood Working Bottom Cleaning Bit - 8mm/ 0.315in Shank - 5mm/ 6mm/ 8mm/ 10mm/ 12mm/ 16mm/ 18mm Cutting Diameter. Industrial grade micro grain carbide blade, suitable for hand-making or woodworking. Made of high quality carbide alloy forging blade blades for a sharper & longer lasting edge. Build-up & heat resistant polytef coating, anti-kickback design. Mainly used for cutting and smoothing a variety of materials from wood, plywood, MDF and other wood composites etc. Specification: Material: Carbide alloy Size(Approx.): (Shank x Cutting Diameter) 8x5mm/ 0.315x0.197-in 8x6mm/ 0.315x0.236-in 8x8mm/ 0.315x0.315-in 8x10mm/ 0.315x0.393-in 8x12mm/ 0.315x0.472-in 8x16mm/ 0.315x0.63-in 8x18mm/ 0.315x0.7-in Total Length: Approx. 48.3mm/ 1.9in 49mm/ 1.93in 55.5mm/ 2.18in 48.8mm/ 1.92in 49mm/ 1.93in 48.7mm/ 1.91in 49mm/ 1.93in Color: Black Quantity: 1pc 8x5mm, 1pc 8x6mm,1pc 8x8mm, 1pc 8x10mm, 1pc 8x12mm, 1pc 8x16mm, 1pc 8x18mm, 7Pcs in total. Package Includes: 7 Pieces of Bottom Cleaning Dado Router Bits Note: The color may have different as the difference display, pls understand. Please allow 1-3mm error due to hand test.