Material: mild steel-2.0mm
Surface treatment: hot dip galvanized
| Item code | Spec | External dimensions mm | Clear opening mm | Height mm |
| 310101 | 200*200 | 250*250 | 156*156 | 50 |
| 310102 | 300*300 | 350*350 | 256*256 | 50 |
| 310103 | 400*400 | 450*450 | 356*356 | 50 |
| 310104 | 500*500 | 550*550 | 456*456 | 50 |
| 310105 | 600*600 | 650*650 | 556*556 | 50 |
| 310106 | 700*700 | 750*750 | 756*756 | 50 |
| 310201 | 200*200 | 250*250 | 156*156 | 80 |
| 310202 | 250*250 | 300*300 | 206*206 | 80 |
| 310203 | 300*300 | 350*350 | 256*256 | 80 |
| 310204 | 350*350 | 400*400 | 306*306 | 80 |
| 310205 | 400*400 | 450*450 | 356*356 | 80 |
| 310206 | 450*450 | 500*500 | 406*406 | 80 |
| 310207 | 500*500 | 550*550 | 456*456 | 80 |
| 310208 | 550*550 | 650*650 | 506*506 | 80 |
| 310209 | 600*600 | 650*650 | 556*556 | 80 |
| 310210 | 650*650 | 700*700 | 606*606 | 80 |
| 310211 | 700*700 | 750*750 | 656*656 | 80 |
| 310212 | 750*750 | 800*800 | 706*706 | 80 |
| 310213 | 800*800 | 850*850 | 756*756 | 80 |