The Ibanez 4449EB6X was a Prestige-line nut file set produced for electric bass guitar, offered as a set of six files sized to match the standard string gauges used across Ibanez Prestige bass instruments.

The set covered six gauges: .032, .045, .065, .085, .105, and .130 — spanning light treble strings through heavy bass strings. Each file was sized to cut or dress nut slots to the specific width required for its corresponding gauge, allowing precise slot fitting without undercut or binding.

Owners working on nut slot maintenance or replacement should consult a qualified luthier or guitar technician, as nut filing is a non-reversible operation and improper technique can affect intonation, action, and string seating permanently.