Crafted L.H.Dottie® Double Expansion Anchor, Zamac Alloy, 1/2″-13, 25 Pack

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.