Item Type: Spiral Ball End Mill Material: Tungsten steel Color: Blue Total Length: Approx. 40mm / 1.6in Shank Diameter: Approx. 3.175mm / 0.1in Blade Length: Approx. 12mm / 0.5in Drill Diameter: Approx. 1.5mm / 0.1in Package List 1 x Spiral Ball End Mill 1Widely used for engraving and drilling of hardwood, plywood, acrylic, plastic fiber, resin, PCB and other materials. 22-blade spherical nose screw bit, used for carving and carving curved surfaces, easy to remove chips, very suitable for 3D carving 3The nanoblue coating enhances the hardness, thereby prolonging the service life, and the drill bit is more durable and wearresistant. 4The cutting edge is sharping, the surface is free of burrs, and the superfine hard tungsten steel material can ensure its engraving and milling performance. 5Great workmanship, perfect replacement for the old one and has a long service life.