Microdermals

[piercingxprincess]

Yea im thinking about getting some dermals too but i wanted to find some information before i do it. I already bought 12G anchors but i wanted to know what size dermal puncher would be used? Is there certain jewlery size(gauge) for certain locations on the body

ex:

If i wanted to get a dermal on my finger would i need to buy a smaller gauge with a smaller rise?

Im well aware that its not my job to buy the jewelry but i need a different type of metal then my piercer has. Please can someone help me, I like to know before i get it.