Item Type: Spiral Ball End Mill Material: Tungsten Steel Color: Blue Plating Total Length: Approx. 40mm/1.6in Handle Diameter: Approx. 3.175mm/0.13in Blade Length: Approx. 12mm/0.5in Drill Diameter: Approx. 2.5mm/0.1in Package List 1 x Spiral Ball End Mill 12flute spherical nose spiral drill bit for carving curved surfaces, easy to remove chips. 2The nanometersblue coating enhances the hardness, prolonging the service life, and the drill bit is more durable and wearresistant. 3The cutting edge is sharped and the surface has no burrs. Ultrafine tungsten steel material can insure its engraving and milling performance. 4It is used for engraving, drilling, milling, cutting and 3D embossing and engraving of hardwood, plywood, acrylic, plastic fiber, resin, PCB and other materials. 5Compact size, lightweight and portable, easy to install and store, bring much convenience for you.