A Genuine Toyota OEM JZA80 & JZA70 Supra Targa Wrench Tool.
This tool is used to loosen and tighten the supra allen key bolts in each corner. This helps with the tight clearances the bolts have to the roof lining and over time these do tend to go missing or strip on the inside so it is always good to replace or keep a spare away for such a cheap item.