| 摘要 |
PURPOSE: A screw anchor is provided to allow a user to easily carry out fastening work for the screw anchor by using a driver even when the screw anchor is fixed to a ceiling without performing hammering work. CONSTITUTION: A screw anchor includes a screw section and a nail section. After forming a small hole in a wood wall or a concrete wall, the screw anchor is fixedly inserted into the small hole formed in the wood wall or the concrete wall by means of a driver. The screw anchor is easily and efficiently inserted into the small hole formed in the wood wall or the concrete wall without performing hammering work. A cross-shaped groove is formed at a head portion of the screw anchor. A bolt or a nut is attached to the head portion of the screw anchor.
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