GL Ribbed inserts
| Article No. | Outer tube diameter [mm] |
|---|---|
| GL / 10 | 10 |
| GL / 12 | 12 |
| GL / 13 | 13 |
| GL / 14 | 14 |
| GL / 15 | 15 |
| GL / 16 | 16 |
| GL / 18 | 18 |
| GL / 19 | 19 |
| GL / 20 | 20 |
| GL / 21 | 21 |
| GL / 22 | 22 |
| GL / 23 | 23 |
| GL / 24 | 24 |
| GL / 25 | 25 |
| GL / 26 | 26 |
| GL / 27 | 27 |
| GL / 28 | 28 |
| GL / 30 | 30 |
| GL / 32 | 32 |
| GL / 34 | 34 |
| GL / 35 | 35 |
| GL / 36 | 36 |
| GL / 37 | 37 |
| GL / 38 | 38 |
| GL / 40 | 40 |
| GL / 42 | 42 |
| GL / 48 | 48 |
| GL / 50 | 50 |
| GL / 55 | 55 |
| GL / 60 | 60 |
Colour: black, white, grey (other colours possible)