Features High build quality and high surface quality and can make various high-precision mold cavities. The rotating cutter is used for heavy-duty rotating lapping sleeves of drills, pneumatic tools and die grinders. Before using the product, you need to grind, polish, carve and polish wooden surfaces. Most commonly applicable to 1/8" shank, suitable for all electric and cordless drills. Long service life, 10 times more durable than high speed steel cutting tools and 200 times more durable than small grinding wheels. Specification: Condition: 100% Brand New Item Type:Rotary Burr Material: carbon steel. Colour: black. Specification shape: ball, oval, cylinder, large and small cone Handle diameter: approx. 6.1 mm / 0.24 inches. Package list: 10 x electric black file grinding head. Note: This carpenter rotary file is only suitable for cork and other soft materials and cannot be used for carving and grinding hardwood. Package List 10 x Electric Black File Grinding Head