With knurlingSurface: Chromed, polishedDIN 3124, ISO 2725-1Made In GermanyDrive: Square 6,3 mm (1/4 inches)Output: Outer hexagon traction profileKey width: 10 mmDimensions / Length: 25 mmDiameter d1 (on the output):14.6 mm Diameter d2 (on the drive): 12.5 mm Net weight (kg): 0.02 kg For manual operation 850-3 outside the DIN series