Flower Van furniture handle
The size is 44mm x 38mm, with a depth of 23mm.
I have melted these (M4 x 8,1 x 6,3mm) threads:
https://www.amazon.de/gp/product/B09PBJDCXW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
It fits perfectly.
Have fun printing!