StewMac Double-edge Nut Files

The most durable and efficient nut-slotting files available. Specially designed for nut slotting, each file cuts two different width slots. Each 9/16 inch x 7-5/8 inch (14.29mm x 193.67mm) steel file cuts on the edges only, and tapers from the center to a different thickness on each cutting edge. Rubber-coated handles give firm, comfortable control for the job. The complete set includes edge widths for filing round-bottom nut slots on most stringed instruments, including basses. Each file’s cutting edge is approximately 3-7/8 inch (98.43mm) long. What files do I need? Choose nut slotting files that are the same size or no more that a few thousands larger than your individual string gauges. A smaller file can also be rocked side-to-side to widen a slot to the desired size. For example, you can cut a .043 inch slot with a .042 inch file by moving it around a bit. Here’s how: make a cut on a scrap piece of bone or wood with both sides of the nut file, then measure the width of each cut with feeler gauges to determine which side is which. Guitar strings of known gauges will also work as measuring tools in a pinch. Once you have determined the proper edge, mark the file accordingly with a permanent marker.