Horseshoe- and trunk-nails are of this sort.

They are of the same shape as cut nails.
Wire nails are made from drawn steel wire, and are pointed, headed, and roughened by machinery.

They are comparatively cheap, hold nearly if not quite as well as cut nails, which they have largely displaced, can be bent without breaking, and can be clinched.
Nails are also classified according to the shape of their heads; as, common or flat-heads, and brads or finishing nails.

Flat-heads are used in ordinary work, where the heads are not to be sunk in the wood or "set." Some nails get their names from their special uses; as, shingle-nails, trunk-nails, boat-nails, lath-nails, picture-nails, barrel-nails, etc.
The size of nails is indicated by the length in inches, and by the size of the wire for wire nails.

The old nomenclature for cut nails also survives, in which certain numbers are prefixed to "penny." For example, a threepenny nail is 1-1/4" long, a fourpenny nail is 1-1/2" long, a fivepenny nail is 1-3/4" long, a sixpenny nail is 2" long.