Wide Application: Burrs are suitable for fine detail work, such as metalworking, model making, wood carving, engraving, beveling, chamfering, grooving, reaming, hollowing and more. These tools are ideal for DIY, crafts, hobbies, household repairs, jewelry, lapidary use, modeling and more. It is also a great gift for artist friends who love DIY carving. Premium Material: The rotary burr set is made of high quality tungsten carbide steel, high hardness, good abrasion resistance, sturdy and durable. The woodworking burr is used for deburring and polishing iron, steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, as well as marble, jade and bone. Double Cutter Head: The groove lines of these rotary burr heads are designed in a cross shape, which greatly improves work efficiency. Its processing efficiency is dozens of times higher than that of the hand file. Universal Size: Shank Diameter: 3 mm (1/8"), Grinding Heads Diameter: 6 mm (1/4"). The 3 mm shank