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 mmSolid 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 brokenApplicable 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 grindingPackage 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 Colour:Pink + SilverMaterial:Chrome steel jade + alloySize:49x4.8mm Package Contents:50 * Burr Grinding Stone File Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.