1.High Quality Material: Tungsten Carbide Rotary Bit Files Tungsten Alloy Solid Steel Burr Diamond Bits is made of Tungsten Steel (Hard), with high hardness, wear resistance, good strength and toughness, the heat, corrosion and a series of excellent performance^ 2.Multi-purpose: Rotary Burr Set Tungsten Carbide Cutting Mill Bit Carving Tools are suitable for copper, aluminum and other thin metals, also marble, jade, bone, etc. non-metal^ 3.Multifunction: 20 Head Tungsten Carbide Rotary Point Burr Die Grinder Drill Bits is an idea for engraving, beveling, chamfering, grooving, reaming, hollow and so on^ 4.Compatibility: 1/8 '' Shank Rotary Cutter Set for most rotary tools or mini grinder,^ 5.Exquisite Packing: 20Pcs Different Top Quality Rotary Tungsten Carbide Burs is Orderly Packed in a Nice Box as Pictures Show, Easy to Place and Carry^