| 摘要 |
<p>The fastening consists of a stepped ring (5) of an injectionmoulded material, having a through hole (9) with an optional threaded surface for a fixing screw (8), and an upper rim (7) that fits into the grooves in the edges of two adjacent boards. The hole is offset to one side of the ring's centre so that the screw head is concealed by the overlapping upper edge of one of the boards.</p> |
