French to English Tech/Engineering Fisheries Precision engineering

I am not sure if I have filtered this question correctly (fisheries) but I need help with some industry-specific terms.

I am doing my best to translate some text (which is, unfortunately only in brief note form) describing the activities of a precision-machining company, which makes small parts for various industries (including, inter alia, the aerospace and medical industries) and have come across these three terms which are clearly to do with the fishing industry. I think (but am not sure, as this is really not my area!) they might mean something like:
perle = bead (I just about get this one!)
bille = bead head? (I don't know what this is, though)
tube = tube? (exactly what kind of tube, I wonder?)

It looks to me as if these headings are intended to give a general idea of the sort of thing they can manufacture with regard to the fishing industry, but really need some help with choosing the right terms.

Anyway, here is the context (pls. excuse missing accents):

Aersopatial, medical, titane, maval, inconel tolerance 6 microns;
Industrie peche: billes, perle, tubes;
Decoration: boulons ecrous
Ameublement: cheville, vis

Thanks in advance for any help.