Check the listing for details. Nut Bone for Banjo 4 String 30mm 1 3/16 inch 109470. Color: bone, Condition: New. Listed at 9.59 USD. Nut, Bone for Banjo 4 String Carved Natural Oxen Bone Construction 30mm length (1 3/16") x 5mm (just under 13/64") Pre-Slotted string locations. Specifications: Right Hand 4 string banjo setup Overall width 1 3/16" (30mm, 1.2") Carved Oxen Bone nut. Pre-slotted for standard string setup Overall width is 5mm (.199") Bottom edge is flat This product is a carved oxen bone nut. Please note: due to the variations in banjo setups, you may need to sand or adjust this part to fit your specific banjo. There are a number of radius and bottom setups, widths and other details that vary from banjo manufacturers, if you have questions, please email us, we will try to answer your questions as to fit, we cannot guarantee fit for specific banjos, there are so many variations from year to year and model to model. You may need to adjust this product to fit your specific application.