Dungeon cell doors would have been lock with a padlock similar to the Prison Cell Medieval Padlock.  This padlock is not just large; its massive in size, with whopping dimensions of 8.50 x 7.50  Constructed entirely out of iron and is fully functional.  Included are 2 keys on a chainmail keyring.  This piece is great to use in plays, movies, or re-enactments. Overall Width: 7.50 Inches  Overall Length: 8.50 Inches