HI Damian,
Not Randy, but as far as I can tell, the "85" stands for the millimeters of open space in the "hand" part between the arms.
The "lugs" in the picture are the adjustable arms that go into the top and bottom of the handle. The do allow some overhang adjustment, and of course line spacing. There are two included, made of thin steel. All the screws are allen/socket head and metric and a set of allen wrenches are included.
I am sure Randy will comment and correct me if I am wrong.
Bill