- Outside square Drive 12.5 = 1⁄2″ – Inside square (Robertson) Drive 20 = 3⁄4″
- With borehole for locking pin or safety spring and grove for O-ring
- Surface: phosphatized, oiled
- Made in Germany
- Drive: Square, hollow 20 mm (3/4 inch)
- Output: Square, solid 12.5 mm (1/2 inch)
- Dimensions: 56 mm
- Net weight: 0.33 kg