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 about 0.12 inch (3 mm) in diameter and 1.81 inches (46 mm) in length. Solid material: The 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. Applicable occasions: These polishing and grinding tools are widely used in machinery, bearings, molds, casting parts, deep holes, internal surfaces, welding spots, weld seams, and burr removal. Package content: Includes 50 pieces of burr grinding stone files, sufficient for daily use and replacements. Material: Chrome steel jade + alloy Color: Pink + silver Package Contents: 50 x Burr Grinding Stone File Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.