1Vibration Free: Possess 2 flute, sturdy and vibration free. The drill bit is well balanced and will not pull to one side, very stable 2Hardened and Sharpened Tip: Hard tungsten steel tip can increase speed and service life, processed after hardened and sharpened, more durable 3Anti Backlash Blade: Hard tungsten steel blade adopt anti backlash design, which will not burn the notch 4Stable Cutting and Accurate Engraving: The blade has high strength and hardness, sharpness, stable cutting, and high engraving accuracy 5For Cutting Beading Grooving: Cove box router bit can be used for cutting, beading, grooving and general decoration, very practical Item Type: Cove Box Router Bit Commodity Material: Tungsten steel Cutting Diameter: Approx. 18mm / 0.7in 12mm / 0.5in 10mm / 0.4in 8mm / 0.3in 6mm / 0.2in Tool Handle: Approx. 6mm / 0.2in Uses: Round nose router for cutting, beading, grooving and general decoration 5 x Cove Box Router BitDo not cut metal and non wood materials, such as steel, iron, sand, etc.