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This is the essential dapping block, and includes eight dapping tools with matching block. Itâs really all one needs for virtually any job that has to do with metal media, dapping, punching, forming, sinking or dishing. Cavity sizes are 28, 24, 20, 18, 15, 12, 9 and 6mm with corresponding punch diameter. The wood block is completely smooth on the opposite side for use as a bench block. Sinking, also known as doming, dishing or dapping, is a metalworking technique whereby flat sheet metal is formed into a non-flat object by hammering it into a concave indentation. Sinking is used in the manufacture of items from jewelry to plate armor. This set is made of polished steel and comes in a functional wooden stand.