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expansion bolt /ɛkspˈanʃən ˈbəʊlt/ n

中文：膨胀螺栓

中文 · 膨胀螺栓Español · perno de expansiónFrançais · boulon à gaine d’expansion
Meaning：Part composed of a bolt in a sheath that bends when the bolt is inserted, then flattens out against the inside of the wall. washers
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Screws

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