PRESTRESSED CONCRETE
| PRO 3 - PRO 4 - PRO 5 |
| 24" | 26" | 28" | 30" | 32" | 36" | 42" | 48" |
| 24 x 250 | 26 x 250 | 28 x 250 | 30 x 250 | 32 x 250 | 36 x 250 | 42 x 250 | 48 x 250 |
| 24 x 310 | 26 x 310 | 28 x 310 | 30 x 310 | 32 x 310 | 36 x 310 | 42 x 310 | 48 x 310 |
| 24 x 350 | 26 x 350 | 28 x 350 | 30 x 350 | 32 x 350 | 36 x 350 | 42 x 350 | 48 x 350 |
| 24 x 375 | 26 x 375 | 28 x 375 | 30 x 375 | 32 x 375 | 36 x 375 |