Size detail: each pink grinding head is approximately 0.16 inch (4 mm) in diameter and 0.94 inch (24 mm) in length; the shank measures approximately 0.12 inch (3 mm) in diameter, with a total length of about 1.81 inches (46 mm). Solid construction: burr grinding stone file is made of grinding stone with high hardness, suitable for metal polishing, especially for steel parts after heat treatment; durable and resistant to breakage. Application: these polishing and grinding tools are widely used for machinery, bearings, molds, casting parts, deep holes, internal surfaces, weld spots, weld seams, and deburring operations. Package includes: 50 pieces of burr grinding stone files, sufficient for everyday use and replacements. Material: chrome steel jade + alloy Color: pink + silver Package Contents: 50 x Burr Grinding Stone File Note: The package includes only the items listed above; other items are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.