This is made for a Utilitech 8ft 16/3 power strip (available from Lowes). The same strip is also available in black.
Printed at with 0.1mm layers, and supports on the screw hole.
I use an allen key to tighten and un-tighten the clamp, but you could fashion a nicer knob or a rod to fit the hole.
The author marked this model as their own original creation.