Greenten 6 String Saddle Nut Cattle Bone Slotted for Acoustic Guitar Replacement Guitar bone nut size:43X6X9/9.3/8.5mm (1.692 X 0.236 X 0.354/0.366/0.334 inch) Guitar bone saddle size:72X3X8/8.5/7mm (2.834 X 0.118 X 0.314/0.334/0.275 inch) Nut has pre cut and requires very little experience to install. Designed for acoustic guitar