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Description: 100% brand new and high quality. Type 1:10PCS/BOX 1.Tungsten Carbide cutter Rotary Burr Set CNC Engraving Bit 2.Type: Rotary Burr 3.High production efficiency 4.Long service life 5.Easy to use, safe and reliable Shank diameter: 3mm (About 1/8 '') Cutting edge diameter: 6mm Total length: 40mm 1:Our electric polishing kits has carbide rotary burrs, tungsten steel carbide milling cutter, grinding head and rotary burr cutting tool. 2:Suitable for processing cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, also marble, jade, bone etc. nonmetal. 3:High working efficiency, perfect grinding effect and long using life. 4:Basically replace with handle small grinding wheel, and no dust pollution. 5:Convenient to grind, simple to use, safe and reliable. Type 2:5PCS/SET Material:45# Steel Color:Black Shank diameter: 6mm Shank length: 27-40mm Total length: 50-60mm Highest quality long lasting rotary Rasp set designed For shaping wood, plastics and light alloys 1/4'' (6mm) shank suitable for most electric & cordless drills Used for grinding, polishing, shaping & burnishing wood surfaces Includes 5 Popular Shapes: Ball, Oval, Cylinder, Large Cone, Small Cone.