Solid material: burr grinding stone file is made of grinding stone with good hardness, suitable for metal polishing, especially for steel parts after heat treatment, and not easy to get broken Size detail: each of the grinding head is about 3/16 inch/ 4.8 mm in diameter, 7/8 inch/ 25 mm in length, and the shank part measures about 1/8 inch/3 mm in diameter, total length is . 1-6/8 inch/ 49 mm Applicable occasions: these polishing grinding tools are widely applied for machinery, bearing, mold, casting parts deep hole, different internal , welding spot, welding seam grinding and burr grinding Package content: comes with 50 pieces burr grinding stone files and 1 piece storage box, convenient to carry and store, enough to apply in and meet your replacement needs, Weight: 0.2645547144 pounds, Manufacturer: Ehwisbe