| 摘要 |
<p>A metal fastener for frangible material has a threaded shank (14), a head (12) proximate one end of the shank and a tip (16) at the opposite end. The fastener has a coarse pitch and relatively large ratio of major to minor diameters suited for securing the fastener into frangible material such as drywall or masonry. <IMAGE></p> |
