How do you make 2 models snap with each other at a certain location?

I googled alot about this subject since learning how to snap 2 models at a certain location would be really useful in the game I'm creating.

I saw something like this here: Images

He puts bricks to indicate the snap location. I'm wondering how he did that, I couldn't find any method of doing that.

Thanks

Resolved it, used MoveTo: in order to move them at the correct location then I used weld scripts to weld them.