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Lots of designs are available but here's one type :-
https://www.ironmongerydirect.co.uk/product/spax-washer-head-wirox-screw-80x200mm-pack-50-776456
200 is a long pretty long screw so they will often have a star/allen or alternative head on to avoid caming out.
Airhead
aggi
Cheers, the trouble I'm having is 8mm screws seem rare and only really in 200mm plus lengths. Not sure if it's just something you don't really get.