①. Wide Application: Cutters 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, home repairs, jewelry making, lapidary use, modeling and more. It is also a great gift for artist friends who love DIY carving. ②. Premium Material: The rotary cutter set is made of tungsten carbide steel, with high hardness, good abrasion resistance, robust and durable. The woodworking router bit 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. ③. Double Cutter Head: The groove lines of these rotary cutter heads are cross-shaped design, which greatly improves work efficiency. Its processing efficiency is dozens of times that of hand file. ④. Universal size: Shank diameter: 3mm (1/8"), grinding heads diameter: 6mm (1/4"). The 3mm shank fits electric or pneumatic hand tools. compatible with most rotary tools and grinders.