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one-way head /ˌɒnˈɒf ˈslaʃ ˈvɒljuːm/ n
English · one-way head中文 · 单向槽头Español · tornillo de un solo sentidoFrançais · tête à sens unique
Bedeutung：Slotted head having two opposing quarters removed so that the screw can be turned one way only, making it very difficult to unscrew.
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Screw head types Nail head example

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