These are all made in China by near-slave labour. They find a niche market, and copy all the stuff in the niche, and flood the market.
Sometimes they improve the item, mostly they don’t, and some of the fakes are “perfect” as they are made in the same way by older tech and by hand.
They know what they are doing, the Chinese countfeit market is massive, billions a year, and they fake Levi jeans, aircraft parts, medicines, CDs (from simple green discs from a CD burner, right up to hologramed copies of Windows 2003 with generated keys!) and medicines.
The obvious problems with a cheap fake aircraft part is that it will be made from the wrong steel, and so corrode, rust or just snap under load. Fake medicines can be fatal.
Fake padlocks will tend to be marked as heat treated Boron steel, but will just be your regular carbon or mild steel. The internals will be often very different, as as many corners will be cut as possible during manufacture, even going as far as to make the item useless for it’s purpose, due to lack of understanding, or perhaps just sheer greed. Tolerances will be low, and parts won’t be interchangable.
