Material: Emery, alloyColor: as shown in the pictureShank diameter: 3 mm / 0.118 inches. Grinding head diameter: 4 mm / 0.157 inches. Total length: 46 mm / 1.811 inches. Sanding disc effective length: 13 mm / 0.512 inches. Item quantity: 50pcs / setPackage weight: Approx. 215 g. Box contents: 50 x grinding sharpening tools