Specification: Material: Steel Color: Black (Knurling) + Brown (Wheel) Knurling wheel figure: approx. 0.5mm, 1.0mm, 2.0mm Knurling wheel diameter: approx. 20mm 0.5mm Diagonal Linear Knurling Wheel Knurling pitch:0.5mm Net pulley diameter: approx.26mm Hole diameter:approx.10mm Knurled wheel thickness: approx.8mm 1mm Diagonal Linear Knurling Wheel Knurling pitch: 1.0mm Knurled wheel outer diameter: approx.26mm Hole diameter: approx.10mm Knurled wheel thickness: approx.8mm 2mm Diagonal Linear Knurling Wheel Knurling pitch: 2.0mm Knurled wheel outer diameter: approx. 26mm Hole diameter: approx. 10mm Knurled wheel thickness: approx. 8mm Total size: 25*8mm/1*0.3in (Outer Diameter * Thickness) Weight: Approx.545g/19.2ozPackage list: 1 x Knurling 6 x Knurling Wheel