Kev uas quav plhaub muaj xws li cov nram qab no:
1.Roller zoo li uas qhib corrugation thiab dimpled
2.Roller zoo li uas qhib corrugaton
3.Roller plhaub nrog inclined kaw corrugation thiab dimpled
4.Roller plhaub nrog fishbone corrugation
5.Roller plhaub nrog kaw corrugation thiab dimpled
6.Roller plhaub nrog kaw corrugation
7 .Roller plhaub nrog qhib inclined corrugation
8.Dimpled cov menyuam plhaub
| 1 | Kev uas quav zoo li uas qhib corrugation thiab dimpled |  |
 |
| 2 | Kev uas quav zoo li uas qhib corrugaton |  |
 |
| 3 | Kev uas quav plhaub nrog inclined kaw corrugation thiab dimpled |  |
|
| 4 | Kev uas quav plhaub nrog fishbone corrugation |  |
 |
| 5 | Kev uas quav plhaub nrog kaw corrugation thiab dimpled |  |
|
| 6 | Kev uas quav plhaub nrog kaw corrugation |  |
 |
| 7 | Kev uas quav plhaub nrog qhib inclined corrugation |  |
 |
| 8 | Dimpled cov menyuam plhaub |  |
 |
Duab
