High quality. Easy nut slotting and filing. Perfect for filing string slots into nuts. Widen and shape pin hole slots for a precise fit. As a guitar builder and luthier, I use these files myself all the time. Set of 13 string files, sizes 1-13. The longer shaft length allows for easier handling when filing string slots. Material: Stainless steel Color: Silver Each rod length: 2.5 inches Diameters: 0.14 inch - 0.61 inch, as shown in the pictures Note: These files, especially the smaller ones, are made of thin metal and can bend easily. Work slowly for smoother results. Care is recommended during use to extend the life of the files. Intended for use on wood, bone, and soft metals such as brass and copper. Not recommended for hard or ferrous metals. Package included: 1 x Guitar Nut Slotting and Bridge Pin Hole Slot File Kit Only the above package content is included; other products are not included. Note: Light reflection and different display settings may cause slight color variations between the item and the picture. Measurement error allowance: +/- 1-3 cm.