What are these screws called?

[LLLVäxjö]

I'm about to build a shelf using shelf boards from byggmax, and I would prefer to use these screws with hex heads:

Does anyone know the name and where to buy them?

 

[Paul-Staffanstorp]

Unfortunately, I don't know the name of this type of special screw, but I'm attaching a link that might be useful to someone when discussing screws otherwise.

http://www.heco.se/katalog/pdf/Skruvskolan.pdf

 

[Havsutsikt]

If you can imagine a skull with torx, then the screw is not entirely unlike an anchor screw from Byggmax. But just like the screw in the picture, you need to pre-drill if you're going to use it for a shelf, as the screw splits quite well with the thick material at the top.

 

[Åbacka]

Reminds me a bit of the furniture screws that come with many IKEA furniture. They usually have hex. At Classe, they are called connecting screws:

http://www.clasohlson.se/Product/Product.aspx?id=135927769

 

[LLLVäxjö]

Reminds a bit of the furniture screws that come with many IKEA pieces. They also usually have allen keys. At Classe they're called connecting screws:

[link]

Perfect, thanks. Took it from a large standalone wardrobe.

Thanks to the others as well