StewMac tech advisors specify this set of 6 files to match Light/Medium Gauge acoustic guitar strings (one file each in the following cutting widths: 0.013", 0.016", 0.024", 0.032", 0.042", and 0.056"). Match the file to the string gauge. Choose a file of the same size as the string, or no more than a few thousandths wider.
By rocking the file side to side, you can widen the slot to fit a slightly wider string. The item "StewMac Nut Slotting Files for Acoustic Guitar-Set of 6 For Light/Medium Strings" is in sale since Friday, May 12, 2017.This item is in the category "Musical Instruments & Gear\Guitars & Basses\Guitar Builder/Luthier Supply". The seller is "stewart-macdonald" and is located in Athens, Ohio. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Turks and caicos islands, Bangladesh, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Nicaragua, Peru, Pakistan, Paraguay, Viet nam, Uruguay, Russian federation, South africa, Colombia, Antigua and barbuda, Saint lucia, Barbados, Bermuda, Cayman islands, Sri lanka, Maldives, Oman, Reunion.