Stretchers and Strainers: Materials and Equipment - Wiki
Nail plates were rolled to make them narrower and thinner so that they could be run through a slitting mill, thus slitting the plate into long, narrow strips called nail rods, usually about 1/4" square….The blacksmith could put several nail rods into his forge, heat them up, and easily cut them into shorter "blanks" of a workable length.
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