Egg-laying log (for stag beetle egg-laying)

This is an egg-laying log purchased from Fujicon around this summer.
I believe the wood species is Konara (oak).
(It might be mixed with Kunugi (another type of oak)).
It's slightly hard as I planned to use it for *Prosopocoilus crucivittatus* or *Dorcus formosanus*.
Please check the images for length and thickness.