What are the keys? They are copper things that open doors. I think the ones specifically mention in the NT are a set of 3 skeleton keys that open a secret compartment under the Chair of Peter were they keep all the really secret archives that disprove Catholism. :>)
Please see smiley face above
I will present one of the keys and challenge anyone here to even identify the substance of it. Surely what with all the disputing of who possessed them we know what they are?
Isaiah 22:22 And the key of the house of David will I lay upon his shoulder; so he shall open, and none shall shut; and he shall shut, and none shall open.
Revelation 3:7 And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;