What would be a specialised store in Brussels where you can buy all kinds of different screws? I thought about Facq, but I'm not sure if they have so much variety in terms of sizes.
Check out the Brico website to see whether they stock what you need. And the website of any other DIY store in your area.
Try any hardware store in belgium. The most obvious one, as others have mentioned, is Brico.
Facq is a shop that sells fitted bathrooms, and associated plumbing supplies.
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