- With knurling
- Surface: chrome-plated, polished
- DIN 3124, ISO 2725-1
- Made in Germany
- Drive: Square, hollow 6.3 mm (1/4 inch)
- Output: Outside hexagon Traction profile
- Wrench size: 4 mm
- Dimensions / length: 25 mm
- Diameter d1 (output side): 6.8 mm
- Diameter d2 (drive side): 11 mm
- Net weight: 0.01 kg
850-3 not according to DIN