This is a handy set of round files, originally intended for cleaning the tips of torch welders, but absolutely 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 longer shaft length with 25mm grinding length and 30mm length of the hilt, which makes them easier to use for filing string slots. Please Note: These files, especially the smaller ones, are thin diameter and bend easily. As such, some care is recommended when using them, so that they will last you a good while.These longer-shaft files are easier to use than the shorter ones commonly available at home improvement stores.Color: SilverMaterial: MetalFiles 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*90mmQuantity: 9 pcs (3 pcs 320 grit, 6 pcs 240 grit)If you have always had trouble getting your string just right, or want get the best high of your saddle and nut, pick up one of these and give them a tryPackage Include: 1 * 13-Size Metal Needle Flat file9 * Sand Paper (3 pcs 320 grit, 6 pcs 240 grit)Note: Light shooting 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.