Knurling wheel Image: about 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: about 26mm / 1.02 inch Aperture: about 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: about 26mm / 1.02 inches Aperture: about 10 mm/0.39 inch Knurling wheel thickness: about 8 mm / 0.31 inch 2mm diagonal linear knurling wheel: Knurling pitch: 2.0mm Knurling wheel outer diameter: about 26mm / 1.02 inches Aperture: about 10 mm/0.39 inch Knurling wheel thickness: about 8 mm / 0.31 inch Total size: 25 x 8mm / 0.31 x 0.98 inch (outer diameter x thickness) Colour:Black Material:Steel Package Contents: 3 x Knurling tool 18 x knurling wheel Only the above package content, other products are not included. Note: Light reflection 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.