This is a round files, originally intended for cleaning the tips of torch welders, perfect for filing string slots into nuts and bridges The self-contained set features a range of 13 sizes( from 0.4mm - 1.6mm). Unlike most standard tip cleaners, these feature shaft length with 25mm grinding length and 30mm length of the hilt, which makes easier to use for filing string slots. Note: These files, especially the smaller ones, are thin diameter and bend . As such, care is recommended when using , so that they will last you a good while. These -shaft files are easier to use than the shorter ones commonly available improvement stores. Color: Silver Material: Metal Files Size: 0.4mm / 0.5mm / 0.6mm / 0.7mm(2pcs) / 0.8mm / 0.9mm / 1.0mm(2pcs) / 1.1mm / 1.2mm / 1.4mm / 1.6 mm, 25mm grinding length and 30mm length of the hilt. About The Sand Paper: The Sand Paper let you can adjust the high of your saddle and nut anytime, you can use it polish the finger board, fret, side, strings etc also. Size: 70mm*90mm : 9 pcs (3 pcs 320 grit, 6 pcs 240 grit) If you have always had your string , or the best high of your saddle and nut, one of these and give a try Package Contents: 1 * 13-Size Metal Needle Flat file 9 * Sand Paper (3 pcs 320 grit, 6 pcs 240 grit) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.