Absolutely perfect for filing string slots into nuts and bridges for guitars. Suitable for polishing guitar, mandolin, bass, ukulele and banjo. Almost suitable for strings of any specification between 008-058.There will be no noise and no uneven vibration in filing. Good repair tool for luthiers to polishing guitars. Return Policy: Haofy is a great brand for Polish Tool , we provide a 30 days full- return if there is any problem with the product. customer service will be there for you during the day and night, Weight: 0.04 pounds, Manufacturer: Haofy