This is a osVAC M32 adapter for the Bosch GST 12V-70 jigsaw. It is secured with 3 screws. The inner diameter is 28 mm, maybe it fits on similar tools.
You'll also need:
I recommend to first drill holes for the screws with a 1 mm or 1.5 mm drill before screwing the screws in.
The Model is based on the great osVAC neo project by TOKENIZER.
The author remixed this model.