What are test hooks used for in an electric tool kit?

[tsuwal]

I just bought a eletric tool kit and this thing came with it:

I think they are called test hooks but i just can't figure out what are they for.. I can't find nothing that connects to the top hole of that thing.

 

[Averagesupernova]

They do the same thing as an alligator clip only in a different way. Sometimes better. Pull the button off and there is likely a place to solder to underneath. I have always called them e-z hooks.