ZDC Black powder coated 6mm countersunk threaded holes
https://www.allbro.com/itemdetails/switchboard-components/hinges/pedestal-hinges/pedestal-hinges/zdc-black-powder-coated-6mm-countersunk-threaded-holes?code=083---005&type=2&access=2&id=15466dc9-5376-44b3-a4c7-f01b599a8bbd