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Ceiling keel's specification
| Ceiling keel | 1 | ceiling keel with bearing | 60×28×1.5 |
| 2 | ceiling keel without bearing | 60×27×0.6 | |
| 3 | UC50 main keel | 50×15×1.5 | |
| 4 | UC50 keel | 50×19×0.5 | |
| | UC38 main keel | 38×12×1.0 | |
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galvanized steel for ceiling channel and
