1. Premium Material, Made of High Quality Tungsten Steel. Used on wood, iron, steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, as well as marble, jade, bones, etc. 2. All cutters have a 1/8 inch shank - compatible with most rotary tools and die grinders. 3. Highly recommended for DIY, crafts, hobbies, home repairs, jewelry making, lapidary use, modeling, and much more. 4. 10 different countersink tools including: ball, cone, cylinder, needle point, conical point, etc., to meet most of your drilling needs, suitable for drilling, engraving, carving, polishing, beveling, chamfering, grooving, reaming and hollowing. 5. The speed of rotary tools is usually 6000-50000 rpm, ensuring long life and avoiding inefficiency in rotation. Ease of cutting, safety and durability. Product Carbide Burrs (Rotary Files) are manufactured from high quality tungsten carbide steel to ensure their strength and durability. The carbide burs are specially designed to cut efficiently, and the 1/8-inch shank is compatible with most rotary tools. Perfect gift and essential for DIY enthusiasts and metalworkers. Please wear appropriate personal protective equipment, such as gloves and eye protection, when using rotary tools equipped with carbide cutters. The carbide burr set fits and works with all hand-held rotary tools. It includes bur heads in different shapes and sizes to provide flexibility and enable fine and precise work such as engraving. The carbide burr set is made from heat-treated tungsten carbide which is extremely hard, tough, durable and resilient. The carbide milling head is more durable than cutting tools such as HSS steel saw, resin wheel and other cutting wheels. Each carbide milling head is designed with rows of cutting teeth in two directions that intersect to maximize cutting and stock removal efficiency. The tooth angle is designed to minimize chipping, ensuring long life. The carbide burr set is ideal for precision work and versatile, useful for a variety of uses such as metal working, die sinking, surface cleaning, tool making, wood carving, jewelry making, deburring, sanding, grinding, cylinder head porting, carving and chamfering wood, metal and stone materials. Excellent ability to cut carbon steel, alloy steel, stainless steel and hardened steel.