| 摘要 |
A double-headed screw can be used for mounting a pool skimmer, or for other purposes. The screw has a threaded shank and inner and outer heads which are spaced apart to form a gap. A skimmer guard for a swimming pool, or some other generally flat structure, can be inserted within the gap without the need for special mounting tools or fasteners. The inner head has a conical shape, and may be inserted within a countersunk hole.
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