1Hardened and Sharpened Tip: Hard tungsten steel tip can increase speed and service life, made after hardened and sharpened, more durable 2Anti Backlash Blade: Hard tungsten steel blade with anti backlash design, which will not burn the notch 3Stable Cutting and Accurate Engraving: The blade has high strength and hardness, sharpness, stable cutting, high engraving accuracy. Cutting wood smoothly without burrs 4Vibration Free: Possess 2 flute, sturdy and vibration free. The drill bit is well balanced and will not pull to one side 5For Cutting Beading Grooving: Cove box router bit can be used for cutting, beading, grooving and general decoration Item Type: Cove Box Router Bit Commodity Material: Tungsten steel Cutting Diameter: Approx. 32mm or 1.3in 25mm or 1in 22mm or 0.9in 16mm or 0.6in Tool Handle: Approx. 6mm or 0.2in Uses: Round nose router for cutting, beading, grooving and general decoration 4 x Cove Box Router Bit Do not cut metal and non wood materials, such as steel, iron, sand, etc.