I need Ballscrew end machined....what do I tell the Chinese bloke doing the work?

[HankMcSpank]

(As per the title, the bloke doing the work is Chinese, so I need to keep the instructions simple ...

I need some sfu1204 machined & need the resulting ends to be a tight fit when inserted into a bearing with an 8mm ID / bore.

But what would a tight fit be? 7.99mm? (because obviously 8mm machined ends will not fit into a bearing with an 8mm ID)