High Quality: The drill bit set is made of high quality tungsten steel, which is perfect for iron, steel, carbon steel, alloy steel, stainless steel, to copper, aluminum, etc. Applicable drill bit: The drill bit set is suitable for most rotary tools such as Dremel, Proxxon, Mister Tool, Einhell, etc. and the same type of machines. Tool holder diameter: 3 mm, cutting edge diameter: 6 mm, total length: 43.5 ~ 50mm Multifunction: The jigsaw drill can be used for cutting, chamfering, grooving, reaming, hollowing, etc. Processing efficiency is ten times that of manual sanding tools and nearly ten times that of small handle wheels Wide range of applications: Rotary wheel can be used for engraving , milling soft materials such as softwood, plastic, etc., and the surface is smooth after engraving. Portable: The rotary grinding wheel is packed in a portable box, no need to keep the Order Product Pack of 10 Tungsten Carbide Rotary Drill Bits for Dremel Rotary Tools, Grinders, Metal Drilling, Engraving and Polishing Features: Material: tungsten steel. Shank: 3 mm. Head: 6 mm. Total length: (43.5 50) mm. Quantity : 10 pieces. Features: Various shapes and sizes: sphere, cone, round cylinder, flat top cylinder, cone. 2. Cleaning of cuts, lines and welds in foundry, forging and welding. 3. Highly recommended for jewelers, gemstone use, hobby, crafts, styling, home maintenance, etc. 4. Very suitable for filing glass, ceramics, tiles, bricks, plastic, wood, fiberglass, stone, carbide, gold, platinum, silver, metal and all that has a hard surface. 5. Suitable for polishing metals and plastics.