there are usually maybe 6 that come in a tube that is the handle for installing/adjusting the depth of them. you use the size of the hole/thread for the hole you want to transfer--adjust so the pointed tip sticks up a bit above the surface and then tap the material you want the hole in over the points---gices you the center point for drilling---I will usually then take a regular center punch and wack it a little bit more so the drill won't wonder--