These are to fit 4mm diameter bars or rods.
They can be used to fix any item which can be screw-fixed to a 4mm bar.
The hole goes right through the fixing, so that they can support points along the length of the bar, as well as the ends.
They are 2-part fixings -
The inner brass boss can be screwed to the item to be fixed
The outer part fixes to the boss using a grub screw and fixes to the bar to support the item
Fixings are in satin-anodised aluminium