This attachment simply slips over a roller blind bracket to serve as a hook for holding a pole or rod.
It features a snap-fit design that easily snaps onto your existing bracket.

※ Note
Compatibility for this model has only been confirmed with the brackets included with the NITORI "Blackout Roller Screen" linked below.
Please be aware that it may not fit brackets from other manufacturers or products with different shapes.
https://www.nitori-net.jp/ec/product/2114100358454s/