Spindle shaped bollards, with circular section, a consequence of the traditional limestone bollards historically called Fradinhos. Metal tubes may be used to unite the bollards so they may be used as guard rails.

Further information available @
https://www.dacianodacosta.pt/en
https://www.dacianodacosta.pt/en/the-work/detail/urban-renewal-of-praca-da-figueira/243/