| Ref. | Material | L(mm) |
| GS.35 | Galvanized steel | 350 |
| GS.35 I | Stainless steel | 350 |
| GS.40 | Galvanized steel | 400 |
| GS.40 I | Stainless steel | 400 |
| GS.45 | Galvanized steel | 450 |
| GS.45 I | Stainless steel | 450 |
| GS.50 | Galvanized steel | 500 |
| GS.50 I | Stainless steel | 500 |
| GS.55 | Galvanized steel | 550 |
| GS.55 I | Stainless steel | 550 |