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Threaded Expansion Screw 9x30
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墙面固定膨胀螺丝需要使用petg打印适用9mm钻孔，适用螺丝的直径和膨胀效果在图片里其余还有两种样式，坚固且不需要支撑结构，螺纹固定更牢靠放入钻孔内需要用锤敲入适合墙面混凝土墙，砖墙，不适合空心砖瓷砖墙
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