I paid £8.50 for this set so it's not the cheapest detailing pack in the world. I suspect that if you just want spanners then the laser-cutting or etching boys can do the job a lot cheaper.
The other pack is from Ixion:
For £4.50, these really are a bargain. Tooling up to mould in plastic won't have been cheap but the result is a low price in a world where people will spend money. Arguably, the tools are a bit chunky, you could produce much more slender items in wire, but there is a respectable selection.
My favourite feature is the bucket which has a separately applied wire handle. I'd have understood if this had been plastic and just included in the pack, but wire is a real bonus. It would look great hung on the rear lamp iron of a shunter.