It serves as a support
It is installed on the bracket
| Dv, mm | Dn, mm | А, mm | В, mm | С, mm |
| 350 | 420 | 530 | 480 | 30 |
| 400 | 460 | 570 | 520 | 30 |
| 450 | 520 | 630 | 580 | 30 |
| 500 | 560 | 670 | 620 | 30 |
| 550 | 620 | 730 | 680 | 30 |
| 600 | 660 | 770 | 720 | 30 |
| 650 | 720 | 830 | 780 | 50 |
| 700 | 760 | 870 | 820 | 50 |
| 750 | 820 | 930 | 880 | 50 |
| 800 | 860 | 970 | 920 | 50 |
| 900 | 960 | 1110 | 1060 | 50 |
| 1000 | 1060 | 1210 | 1160 | 50 |