Unknown implant: suggestions to remove attachment?

I tried to unscrew the attachments from the implants but my 1.2 hex driver wouldn't even fit to the screw hole on the top of the attachment. Any suggestions on to how remove the attachments?

Source: Dental Implants Discussed by Experts - October 9, 2017 Category: Dentistry Authors: osseonews Tags: Clinical Cases Restorative Source Type: news