| 摘要 |
<p>A bar comprising a plurality of elongate elements 1, 2, 3 positioned side by side. The elongate elements have surface formations 16, 26, 36 thereon which are preferably substantially lozenge-shaped. The projections are spaced apart along the elongate elements and are arranged so as to define a thread-like path P for receiving a screw-threaded member, for example a nut 51. <IMAGE></p> |
