Summary

Extend 15mm for large 2.5mm² cord.

Remixed this to be a bit larger and stronger. Tapered the screw holes so you can put a large wood screw and really tighten it down without crushing the hook. Screw holes are 80mm on center, and 4.5mm diameter. Should be good for holding a large extension cord or hose. I made this specifically to hold the coiled extra cable for our Tesla wall charger.