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- metal pins used to hold stones together. Slate is sometimes used for the same purpose. There are two common shapes, a bar with a right angle at each end, or a double dovetail. Traditionally iron was used, and it was usually clothed in lead, a practice used by the Greeks, but when unprotected, it rusts and expands and can fracture stonework. Now, a non ferrous metal should always be specified. If it is possible to remove iron cramps without causing damage, this should be done. see joggle