This variation has a ring with a width of 0.5 plate heights (4 LDU). If you connect two tiles to the side studs, the whole assembly will have a width of 1 brick (20 LDU) - refer to the second photo below.
Click on a colored part below to see the Sets and MOCs that use part 4081a Plate Special 1 x 1 with Clip Light [Thin Ring] in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.