This is a thread winder that was actually used until the Showa 60s (1985-1989). Size: Approximately 37 x 20 cm Height: Approximately 24 cm You would spread the blue wire-like object as shown in photo 7, fix it to a table or similar with the metal fittings, hook the looped thread onto it, and then wind it onto the spool attached to the main body. The finished result looks like photo 2. (Please note that the green thread is not included; it's just a sample.) For those who appreciate old items, thank you for your consideration.