4.6 V8 Rocker cover bolts

Going to attempt the rocker covers soon (leaking a bit...) and assuming we can remove all the gubbins on top, I don't seem to have a suitable socket in my collection.

I presume they are "bi-hex"/"triple square"/XZN or whatever they are called? But they look like the socket needs to be quite slim?

I'd rather get the right one and avoid breaking things, wherever possible...

I think they are 8mm, so would this Draper one suffice?
Stock No: 27101 Part No: DT-MMB
Expert 8mm 3/8" Square Drive Hi-Torq® 12 Point Deep Socket (Sold Loose) 27101 DT-MMB

Alternatively links to ebay/amazon/halfords (maybe...) would be gratefully received!

And any other odd tools we might find we need mid way through!

Rich

yes 8mm bihex

Is it not actually 5/16"?

I don't need any special sockets to get it just a standard bi-hex one from my set.

3/8 maybe a little big. I got a 1/4 drive and even that's a little tight!

it certainly wont fit my 1/2" drive sockets, so i'm going to need something new... Not sure if I have any smaller ones, currently!