| 摘要 |
A waterproof screw bolt comprising: a head having a bottom surface; and a threaded shank extending from the bottom surface, the threaded shank defining a first ring-shaped groove in the bottom surface around the threaded shank, the head defining a through hole, the through hole running through the head and being in communication with the first ring-shaped groove, the through hole configured to introduce a glue into the first ring-shaped groove. |
