| 摘要 |
A wall fastener for hollow walls, the fastener having two spreadable anchoring blades (20, 22) designed to spread behind the wall following insertion of a screw thereinbetween. The fastener is made of thin sheet metal which has been hardened through a heat treating process, such as quenching. Complementary engaging means (36, 38) on the blades (22, 20) are used to hold the blades (20, 22) together during the heat treatment and to prevent the separation thereof until the screw insertion.
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