Knurling wheel : about 05mm, 10mm, 20mmKnurling wheel diameter: 20 mm/079 inch05mm diagonal linear knurling wheel:Knurling pitch: 05mmNet pulley diameter: about 26mm / 102 inchAperture: about 10 mm/039 inchFlower wheel thickness: approx. 8 mm/031 inch1mm diagonal linear knurling wheel:Knurling pitch: 10mmKnurling wheel outer diameter: about 26mm / 102 inchesAperture: about 10 mm/039 inchKnurling wheel thickness: about 8 mm / 031 inch2mm diagonal linear knurling wheel:Knurling pitch: 20mmKnurling wheel outer diameter: about 26mm / 102 inchesAperture: about 10 mm/039 inchKnurling wheel thickness: about 8 mm / 031 inch size: 25 x 8mm / 031 x 098 inch (outer diameter x thickness)Colour:BlackMaterial:SteelPackage Contents:1 * Knurling 6 * knurling wheelOnly 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.