Knurling wheel : about 05mm, 10mm, 20mm Knurling wheel diameter: 20 mm/079 inch 05mm diagonal linear knurling wheel: Knurling pitch: 05mm Net pulley diameter: about 26mm / 102 inch Aperture: about 10 mm/039 inch Flower wheel thickness: approx. 8 mm/031 inch 1mm diagonal linear knurling wheel: Knurling pitch: 10mm Knurling wheel outer diameter: about 26mm / 102 inches Aperture: about 10 mm/039 inch Knurling wheel thickness: about 8 mm / 031 inch 2mm diagonal linear knurling wheel: Knurling pitch: 20mm Knurling wheel outer diameter: about 26mm / 102 inches Aperture: about 10 mm/039 inch Knurling wheel thickness: about 8 mm / 031 inch size: 25 x 8mm / 031 x 098 inch (outer diameter x thickness) Colour:Black Material:Steel Package Contents: 1 * Knurling 6 * knurling wheel Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.