Size detail: each pink grinding head is about 0.16 inch / 4 mm in diameter and 0.94 inch / 24 mm in length; the shank measures about 0.12 inch / 3 mm in diameter, with a total length of 1.81 inch / 46 mm. 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; durable and not easily broken. Applicable occasions: these polishing grinding tools are widely used in machinery, bearings, molds, casting parts, deep holes, various internal surfaces, welding spots, welding seam grinding, and burr removal. Package content: includes 50 pieces of burr grinding stone files, sufficient for use and replacement needs. Material: chrome steel jade + alloy Color: pink + silver Package Contents: 50 x Burr Grinding Stone File Only the above package content is included; other items are not part of this product. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.