aTourer Tungsten Carbide Burr Set Rotary File 1/4 Shank These 1/4 Carbide Burs (burrs) come in a variety of shapes and sizes, each of which can be used for different purposes: Arch ball/pointed nose – engraving, texturing, increasing hole size Ball – concave cuts, hollowing, shaping, carving. Useful for wood, stone, metal engraving. Ball nose cone – rounding edges, surface finishing, tight spaces, and angles. Carbide Ball nose cylinder – contour finishing Ball nose tree (also known as tapered) – concave cuts and rounding edges Cone – rounding edges, surface finishing, tight spaces, hard to reach areas. Cylindrical – contour finishing and right-angled corners Cylindrical end cut – contour finishing Carbide Cylindrical no end cut – contour finishing Flame – channel work and shaping Inverted cone – v-cuts and rear-side chamfering Oval – die grinding and engraving Pointed tree – concave cuts, rounding edges, access to hard-to-reach areas, and acute angles. Rounded tree – concave cuts and rounding edges Comprehensive The tungsten carbide rotary file can be widely used in steel machinery, aviation, automobile, shipbuilding, chemical industry, sculpture and other industries. And the cutting tools can be used on Aluminum, Brass, Bronze, Carbon fiber, Cast iron, Ceramics, Copper, Fiberglass, Gold, Hard rubber, Plastic, Platinum, Silver, Steel, Stone, Titanium, Wood, Zinc etc. Precautions The rasp set will work with most small rotary tools such as electric drill. The tool needs to be clamped upright (use a wrench to tighten it). Make sure to wear appropriate personal protective equipment such as gloves and protective eye-wear while using carbide burr fitted rotary tools.