Allparts Bone Nut With Curved Bottom For Fender guitars. It is used for the contact point between the strings and the wood and is designed for Fender guitars. This lightweight bone nut is hard and robust and offers good sustain and resonance for your guitar tone whilst helping to keep your strings in tune. It features a curved bottom and has measurements of 1--11/16" x 1/4" x 1/8" (43mm x 6.35mm x 3.18mm) with a radius of 7 -1/4".