Citroen Wing Nut Tool

I've created a tool to assist me in removing my Citroen c3's Light housings which are held on by wing nuts in awkward to reach places, pliers work but are messy and ruin the wing nut over time, so I created this tool to allow me to loosen, remove and tighten the wing nuts suitable. Unsure whatever win nuts this will fit or the sizing but this fits perfect for the Citroen c3 wing nuts, 1cm diameter of the inner circle, 2cm overall.