+**10d** (pronounced "ten-penny") designates a common [Nail](/wiki/Nail) size, traditionally signifying its length. This classification, originating from an old English measure of weight, remains a standard for various [Fastener](/wiki/Fastener) types in construction.
+## See also
+- [Penny](/wiki/Penny)
+- [Hammer](/wiki/Hammer)
+- [Woodworking](/wiki/Woodworking)
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