Round rod made of oak, diameter: 25 mm.
Link:
https://www.amazon.com.be/-/nl/Ronde-stang-van-eikenhout-diameter/dp/B07Y39VN8V/ref=asc_df_B07Y39VN8V/?tag=begogshpadd0d-21&linkCode=df0&hvadid=632994682078&hvpos=&hvnetw=g&hvrand=8294000433409219370&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1001254&hvtargid=pla-853493320977&mcid=64e75677d0c03e6499ff53f504a1cffc&th=1