These are cylindrical shelf brackets with a diameter of Ø5mm, among others, for shelves to be pushed in by hand.
They are very easy to set up.
Their standard availability in white, black, brown (RAL 8011) of PA or PE material according to your needs.
Mainly used in carpentry, in DIY for individuals, we use it to fix a tablet, a console, a shelf on a support ... they can be in all sectors of activity.