Ok this is not your ordinary faucet. It is a single handle but there is not allen wrench hole in the front. There is a hole in the back of the faucet. I have tried using 5 types of allen wrenches and no go. I don't know what to do. HELP!

First, tell us what brand / model of kitchen faucet you have...

Back to you / Milo

I have no clue there is no name on the faucet. It was here when we moved in. It is stainless steel and has a sprayer to the right. It looks older but not really sure what model it is

Post a picture.

Use a mirror to look at the hole in the back side.

This is the URL to a Facebook picture of it

https://www.facebook.com/media/set/?set=a.10151497645304869.1073741825.506424868

Might be a metric allen screw, american sizes won't fit.

Try again, can't see pic
Or post pic here by clicking on "Go Advanced" below, scroll down and click on "Manage Attachments", browse to find pic, open and then click on Upload.