What Size is This Screw?

burrellbloke

Paid Member
When I took my wheels off of the Clio yesterday I noticed an ugly screw that I think holds the arch liner to the bottom of the bodywork.

IMG_1522 (1).jpeg

Can anyone tell me what size/length etc., etc the screw and washer are so I can order some replacements that will not rust?
 
Looking for this screw, other than searching for the Renault part number, has blown my mind. Who knew there were so many different types of screw in the world?

If anyone could point me in the direction of a place to buy, or what to search for, the same size screw in a material that will not rust I would be really grateful?