This is FU-TONE's ultimate locking nut, the "Titanium Locking Nut." It promises a rich, sustained sound thanks to its highest quality titanium material. There are various grades of titanium. The most commonly seen is 40,000 Psi (tensile strength). However, FU-Tone's titanium hardware is made from certified Grade 5 (6AL-4V) titanium alloy. We use a higher quality titanium with a tensile strength of over 140,000 Psi, more than three times that of general titanium. It offers ultimate strength, durability, and performance. It is ultra-lightweight yet incredibly tough. ◆R2: Nut Width 1-5/8 inch Approx. 41.5mm ・Nationwide flat-rate shipping included Other parts also available in our shop! Search for "Mutsumori Gakki"!! #MutsumoriGakki #FUTone #FUTone #TitaniumParts #LockingNut #R2 #GuitarParts #LockNut