This is a wrench for removing and tightening the posts on a pin-lock ('corny' or cornelius style) 5 gallon keg.

The posts normally require a 13/16" socket with either 2 (gas) or 3 (liquid) slots cut out for the pins. This fits both gas and liquid posts.

If you've purchased a used keg and need to remove the posts for the first time, you will need a metal socket on a ratchet with a long handle, since those kegs usually have blown o-rings and the posts have been way over tightened to compensate.

But otherwise, this will work well for removing and tightening posts on kegs with good o-rings. If you tighten your posts down hard enough to break this tool, you will destroy your o-rings. If your keg won't hold pressure without them being tightened that far, you already have!