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Single Shield Expansion AnchorProduct Description : The Single is a machine bolt anchor designed for use in concrete, block, brick, and stone.The Single consists of a pre-assembled set of expansion shields and an expander coneformed from zamac alloy. As the anchor is tightened, the wedge-shaped cone is drawn intothe shields, compressing them against the base material. The Single is not recommendedfor use in overhead applications. Features and Benefits :