| 摘要 |
1. A screw head cap intended to be housed in an orifice comprising a free space above the head of the screw when this latter is screwed home, characterized in that it is formed by a plug of resilient material adapted to leave visible traces when an instrument breaks the surface and is shaped as a cap (1) adapted to cover the top of the screw head by taking on the shape, and surmounted by an outwardly flared truncated cone shaped collar (2) of a height less than that of the cap. |
