Knurling wheel sizes: approximately 0.5mm, 1.0mm, 2.0mm Knurling wheel diameter: 20 mm / 0.79 inch 0.5mm diagonal linear knurling wheel: Knurling pitch: 0.5mm Net pulley diameter: approximately 26mm / 1.02 inch Aperture: approximately 10 mm / 0.39 inch Flower wheel thickness: 8 mm / 0.31 inch 1mm diagonal linear knurling wheel: Knurling pitch: 1.0mm Knurling wheel outer diameter: approximately 26mm / 1.02 inch Aperture: approximately 10 mm / 0.39 inch Knurling wheel thickness: approximately 8 mm / 0.31 inch 2mm diagonal linear knurling wheel: Knurling pitch: 2.0mm Knurling wheel outer diameter: approximately 26mm / 1.02 inch Aperture: approximately 10 mm / 0.39 inch Knurling wheel thickness: approximately 8 mm / 0.31 inch Total size: 25 x 8mm / 0.98 x 0.31 inch (outer diameter x thickness) Color: Black Material: Steel Package Contents: 1 x Knurling tool 6 x Knurling wheels Note: Light and display differences may cause slight variations in the color of the item shown in the picture compared to the actual item. Measurement error is +/- 1-3cm.