Base for a desk, that leaves no visible holes on desk. Holes are made in underside of desk, using M6 Threaded Inserts. Two clamps with M6 thumb screws then lock the base into position.

Parts required (source from Amazon): x2 M6 threaded inserts x2 M6 Thumb screws

Instructions for installation: 1 - print all parts 2 - position the base in desired location on the desk 3 - move the clamps into position, nice and snug 4 - with the clamps in place, mark the holes on the underside of the desk. 5 - carefully drill the holes, and then screw in the M6 threaded inserts. 6 - move everything back into position, and screw the M6 thumbscrews into place. Done!