【Base material】The cutter head is made of high quality tungsten carbide, high hardness, wear resistance, high strength, good toughness, heat resistance, corrosion resistance, sturdy and durable. Its service life is 10 times that of high-speed steel and more than 200 times that of small grinding wheels. Easy to use, safe and reliable. 【Wide range of applications】Applicable to cast iron, stainless steel, copper, aluminum and other types of metals and marble, jade, bone, wood and other non-metals. Double cutter head design, faster cutting time, better polishing effect, greatly improve work efficiency, smooth surface after cutting. Ideal for your DIY woodworking, carving, chamfering, rounding, splitting, rasping, hollowing, sanding, etc. 【Suitable Equipment】10pcs tungsten carbide burrs in a slim plastic case. All files have a shank size of 1/8 inch (3 mm) and a cutting diameter of 1/4 inch (6 mm). Compatible with most electric or pneumatic turning tools. 【Note】 1. The rotation speed is