
1) Metalworking terminology
Found on
https://www.crosswordclues.com/clue/bar-stock

Bar stock, also colloquially known as billet, is a common form of raw purified metal, used by industry to manufacture metal parts and products. ==Process and types== Most metal produced by a steel mill or aluminium plant is formed (via rolling or extrusion) into long continuous strips of various size and shape. These strips are cut at regular inte...
Found on
http://en.wikipedia.org/wiki/Bar_stock

Metal bars of various lengths, made in flat, hexagon, octagon, round, and square shapes from which parts are machined.
Found on
https://www.encyclo.co.uk/local/20687
No exact match found.