Current Projects chat and miscellany

Slightly embarrassing question but at some point either I or the resprayers lost the allen key from my seat post clamp which is built into the frame. It's really tight anyway so I can ride it, but what is that called, is it a seat bolt? Do they tend to be a standard size? Bit anal but I'd quite like a black one. Really hoping it's not a funny size or something.

I somewhat doubt there's a standardised size, pop round to a bike shop and find a bolt for it, condor have a nice selection of them last I remember.