| 
 | This section defines the notches located on each side of the bend: 
 
 | |||||
| 
 | 
 | - Rectangular - Oblound, Depth of arc bottom - Oblound, Depth of arc center | ||||
| 
 | 
 | |||||
| 
 | 
 | |||||
| 
 | 
 | |||||
| 
 | 
 
 | |||||
| 
 | 
 
 
 
 | |||||
| 
 | 
 | 
| Without extra thickness | With extra thickness |