The Killian Septum Speculum (64mm blades) is a specialized surgical instrument used primarily in ENT (ear, nose, and throat) procedures, especially for examining and performing surgeries on the nasal septum. The 64mm blades indicate the length of the speculum's blades, which are designed to open and retract the nasal cavity and septum, allowing the surgeon or physician to get a clear view of the nasal passages and septal structures.