The black duroplastic PF31 that was used for constructing this item comes with a bush and threaded bolt, in galvanized steel. In addition to this, the finish of the surface is impressive, being a high-polished and deburred type.
Next, the 06650-17009 and 06650-18008 versions come with a bush in copper-plated steel. On request, external threads of other types can be supplied, along with screw lengths and different colors.
Thermoset PF 31, black.
Steel bush and stud, electro zinc-plated.
The versions K0181.17008 and K0181.18008 have a copper plated steel bush.
Other screw sizes, screw lengths and colours.