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Double Expansion Machine Screw Anchor are designed for anchoring into concrete, brick, or block base material. Inserting a machine-threaded bolt into the anchor expands it against the concrete at two points. These anchors are made from Zamac Alloy, a non-rusting material. They are intended to be set flush with the base material and are considered a light to medium-duty fastener. It features Easy Bolt Installation/Removal, Corrosion Resistance, Internally Threaded, Dual Cone Expansion.

L.H.Dottie&#174; Double Expansion Anchor, Zamac Alloy, 5/16&quot;-18, 100 Pack

double-expansion-anchor-zamac-alloy-516-18-size-pack-of-100

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