Good morning Darwing,
It’s looks like a Bego Semados RI implant with internal hex connection.
If is this implant there’s no have compatible connection because it’s unique in the world.
All the clinicians that don’t use this type of implant think that it’s the same connection than Zimmer tsv 4.5 mm.
I need if it’s possible to have another periapical xray that we can see all the connection but in 90 % I’ll say that it’s Bego.
1.8 mm screm diameter and 1.25 hex screwdriver.
Thank you for your trust.
Have a nice day