This is a face plate designed for mounting dual USB female sockets to a panel. The dimensions of the plate are 70x25mm, with two 3mm holes spaced 48mm apart. It was designed for mounting a "Dual USB Male to Female Extension Cable" onto 6mm MDF panel. The USB sockets are screwed to the front plate with two M3 screws, and the rear clamp is secured by two nuts on the same screws.
Here's a link to the USB sockets I used:
I replaced the original short screws with two M3x20 screws, long enough to attach the rear clamp.
0.2mm layer height, 0.8mm shell thickness