Sus304 M10 M16 Stainless Steel Anchor Expansion Bolt
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Expansion bolts (also called molly bolts) are similar to anchors, except that once the screw is run through the anchor unit, the unit expands behind the wall, creating a true anchor that won't allow the screw to be pulled out by the weight of the item.
The heavy cardboard casting tube (a form for pouring concrete columns) was wrapped in thin galvanized sheet metal; expansion bolts secure the vertical seam on the back.
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