Table 3: FSW tool geometric features for the shoulder and probe implemented.
| Features | Tool 1 | Tool 2 |
| Shape: ISO M3 LH Length = 1.83mm | Shape: ISO M5 LH Length = 1.83mm | |
| Øext = 14 mm Øint = 3 mm | Øext = 16 mm Øint = 5 mm | |
| Shoulder | Plane + 1 spiral scrool (spiral pitch = 0.5) | Plane + 1 spiral scrool (spiral pitch = 0.5) |
| Photographic representation |  |  |