I have a glacier bay kitchen faucet. The tap is loose and I do not have the right tool to tighten it. I have a set of allen keys but not the right size or does it need something else?

There are both metric and standard allen wrench sets. Have you tried BOTH sets of allen wrenches? If not, determine which type you have (metric or standard) and go purchase the other type of allen wrench set and that should be a perfect fit!

Mark