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I have some small magnets, 2mm I think, but I feel like they wouldn't hold an arm on very well. What is the preferred size for holding a Space Marine Bikers arm on?

Most magnets have a N gauge that indicate its relative strength. Basically the higher the stronger.

I have 2mm magnets myself (I think they are N50 - it was a while since I purchased them). From my experience they are strong enough to hold a space marine arm, however if you find that the holding power isn't enough you can always use a 2nd. The larger the magnet and higher the N gauge the stronger it will hold.

I use 2mm magnets for most of my work with marines. As long as you don’t accidentally sink it too far into the mini, they work just fine.