"These are useful little boxes and considering the low price are perfectly acceptable. They are made from thicker steel than I was expecting and have several 20mm knock-outs and even knock-outs for securing the box.
I bought two of these and both came with the lid screws over tightened from the factory so the threaded plates were bent up a bit and also both boxes were full of swarf! Easily cleaned out with a rag though and the lids still secure without issue.
"Came as a set of 5 boxes. Didn't realise this when ordering... possibly a packing error? Hey ho, sure they'll come in handy; though without an earthing terminal, not as handy as they could've been. "Functional" rather than pretty."