The GraphTech Black TUSQ XL Nut is a great option to replace or upgrade the nut on your Mandolin.

It has a flat bottom and is pre-slotted for a quick and straightforward installation.

Length  1.197”  /  30.4mm
Thickness  0.162”  /  4.11mm
Height  0.299”  /  7.59mm 
String Spacing  0.975”  /  24.77mm