which nut do i need to replace the black one on my epiphone less paul ?

You need to pay very close attention to the string spacing on your guitar. This nut is for a string spacing of 1-3/8". Epiphone Les pauls have a string spacing at the nut of 1 3/8". USA Gibson Les Pauls have a string spacing of 1-7/16". That 1/16" makes a difference. You make sure you get the right one. The string spacing on this particular nut is 1-3/8" which will also fit an ESP LTD EC series guitar. Graph Tech does make an exact fit for a 1-7/16" Les Paul nut. These are good quality.

Will this fit Ibanez Gio guitar? If not can a nut be recommended?

It needs to match the neck radius and the string width. Measure those two things and if it matches this nut then it should fit. To measure the radius I just made a template from cardboard. Height wise this nut has plenty of stock to be fit to any neck. I think I ended up sanding about 1/8" off the bottom to fit it to my Yamaha se350 (strat style guitar).

Will this fit a Jackson js22 dinky ?

Whatever nut you decide on, some adjustment will be needed. If you don’t have the tools to do it, bring to a luthier. If you do decide to do it, you will need a caliper and some files. Good luck.

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グラフテック(Graph Tech) GRAPH TECHIbanez/PRS用 BLACK TUSQ XLナット PT-6643-00

グラフテック(Graph Tech) GRAPH TECHIbanez/PRS用 BLACK TUSQ XLナット PT-6643-00

Product ID: 742750517

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Details

Brand
グラフテック(Graph
Color
black
Top Material Type
Spruce Wood
Back Material Type
Maple Wood
Neck Material Type
Maple

🎶Boosts sustain & tonal clarity

🎸Precision fit for Ibanez/PRS guitars

🔧Pre-slotted for easy installation

Description

🎸 Elevate your guitar’s soul with every string vibration!

PLUG PLAY DESIGN - Pre-slotted nut means minimal setup—get back to playing faster.
UNMATCHED STRING SUSTAIN - Experience longer, richer notes with enhanced vibration transfer.
TUNING STABILITY MASTERED - Friction-reducing Teflon membrane keeps your strings perfectly in tune.
PREMIUM BLACK TUSQ XL MATERIAL - Durable, sleek black finish that complements your guitar’s aesthetics.
RESTORE YOUR GUITARS TRUE VOICE - Unlock lost sonic depth from bouncy trebles to warm, full bass tones.

The Graph Tech BLACK TUSQ XL Nut (PT-6643-00) is a premium replacement nut designed for Ibanez and PRS guitars. Crafted from durable black TUSQ XL material, it features a pre-slotted design for easy installation and significantly improves string sustain, tuning stability, and overall sound quality by reducing friction and enhancing vibration transfer.