Daggers, were not meant really to go against armor, not that kind of dagger at least. Daggers were kind of an everyday tool, carried when it was not really practical to carry a sword. Daggers that were meant to peirce armor, maille mostly, were pretty much big non-edged spikes, with hardened points. A nice dagger like that would be used at the table, and at many other everyday tasks. Nice work.