| 摘要 |
PURPOSE: A detachable hook member bolt is provided to easily install the hook member bolt at the concrete slab of a ceiling while minimizing damage to insulating material and sound absorbing material. CONSTITUTION: A detachable hook member bolt(2S) comprises a connecting bolt(2a) and a bolt for hook(2b) and is formed in order to be separated from and connected to each other. The connecting bolt is connected to an insert(6). The bolt for hook is connected to the connecting bolt.
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