【What You Get】10 different shapes rotary burrs to meet your many needs 【High Quality File】Made of tungsten steel alloy, high micro hardness, high abrasion resistance, good toughness 【Practical Cutting Tool】Cutting edge diameter: 6 mm; Shank Diameter: 3mm, suitable for most small rotary tools 【Double Cut Design】Ideal rotary bit for processing copper, aluminum, alloy, iron, marble, jade, steel, glass, wood and plaster, etc. 【Excellent Rotary Burrs】Widely used for precision work, metalworking, model casting, wood carving, jewelry making, welding, chamfering, deburring, grinding, etc.