Dear John:

What can I say about cançonete? Maybe it's an Italian song, maybe a French one, but not a technical word in Portuguese. Better if you'd verify the proper spelling.

Thanks. Ivan Costa-Pinto.
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In Portuguese, a "canconete" (please imagine the cedilla under the second "c") is a lightt song or popular ditty. Whatever the piece of hardware is, your phrase refers to it in the plural, describing them as having both metric and English threads. In other words, the _canconetes_ come in two versions: one with the threads machined according to the metric system (with millimeters being a likely unit in this case), and the other with threads cut according to the English or (as it's sometimes known) Imperial system, in which the basic units are the inch, foot, yard, and mile. No political correctness here! Good luck with the _canconetes_.

It is obviously "cossinete", which is a die chaser, in this case to cut a thread on a bolt.