This model is for lithophane with the diameter 100mm.
lithophane maker: https://itslitho.com/
bulb socket: https://www.amazon.de/EACLL-Lampenfassung-Hochwertigem-Silikonkabel-Anschlie%C3%9Fen/dp/B07QS1R7WB/ref=sr_1_5?crid=2VYMER4LV9IHF&dib=eyJ2IjoiMSJ9.6TIOwEVgto8Equ2VRpyHhguYEa3OzwrRYLWARmRWNzoyRcWzC62AN10VStiAMfVgG56VvgKTlig8jgvado8exBsOWly5IRbylrFP6d7RAL3JtJKVVmnCvtV0wlThvFi95BsxZwnNv2spWvnMq89zvSvh1PbNSQPl_9UhpxRZXoA7b-wSTMPtcMoFfuCTh8Yi9UTU-DRF4YFmfMWUSqt3iIS676pNUlv0fNdhvH2SsdHlh2uHKT1HLWibkE392Rtd1rFtZ4vCX_D2-plWpd2iq7n_SVKxJsItRSpupZ-Khmg.fO1C_HziDP6oQeZ1m2Dup_fyv2aFzykqY7j4eGdJ4wc&dib_tag=se&keywords=gu+10+fassungen&qid=1705757383&sprefix=gu+10+%2Caps%2C123&sr=8-5
thread insert 3mm: https://www.amazon.de/Gewindeeinsatz-Einpressmutter-Einpressmuttern-Kunststoffteile-Warmeinbettung/dp/B0C6SH1VVF/ref=sr_1_1_sspa?crid=22RP0T92I6ZBX&dib=eyJ2IjoiMSJ9.4sekI893jS_Bk71L9U9_XxVZlQboN75yBNeH_2UXzpNRyyKP5rgseO3zG7OR8e2FhSv6ttemgGggRhwTTf4odRdX13_cggDAIOvo_fsKJTOOi4GkTptO2e5tMbezkCdJ7hN2cRch2jcuKpmdH8ong985QOJaq7uJumfWwVEfKhPYY2Z9dZqWB9MeChiHOy6aVieC9pFw0hSvOYk8nxPG2gGtO5Re7MgceVlzZF3tSzgV4RSpcISf109O9xPXmFHXhJweTMxXv2b6LxdpVfTeOyRulvNsNrZdsVO8etDUTog.IEjjTRPDpKa_DMQRIxZoOge8LyKJ7CaJXcMucJCKzCo&dib_tag=se&keywords=gewindeeinsatz&qid=1705757767&sprefix=Gewinde+e%2Caps%2C100&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1
It was a great gift.
The author marked this model as their own original creation.