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A sleeve anchor is essentially a metal tube or sleeve that is embedded within the concrete during the casting process. The sleeve is designed to accommodate a bolt, rod, or other types of fasteners, which can then be used to attach fixtures, machinery, or other structural elements to the concrete. The anchor's design ensures that it remains firmly in place within the concrete, preventing any movement or slippage that could compromise the structure's stability.

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5 16 18 bolt meaning