Item Type: Spiral Ball End Mill_x000D_Material: Tungsten steel_x000D_Color: Blue_x000D_Total Length: Approx. 40mm / 1.6in_x000D_Shank Diameter: Approx. 3.175mm / 0.1in_x000D_Blade Length: Approx. 3mm / 0.1in_x000D_Drill Diameter: Approx. 1mm / 0.04in 1Used for engraving and drilling of hardwood, plywood, acrylic, plastic fiber, resin, PCB and other materials. 2Very suitable for 3D engraving, 2-blade ballnose spiral drill bit, used for engraving and engraving surface, easy to remove chips. 3The use of nano-blue coating enhances the hardness, thereby prolonging the service life, and the drill bit is more durable and wear-resistant. 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. 5Strict quality control and quality assurance, high safety factor, can be used with peace of mind.1 x Spiral Ball End Mill