Features and Benefits:

• Stainless Steel Grinding Needles - 13 different diameters: 0.4mm / 0.5mm / 0.7mm / 0.75mm / 0.8mm / 0.9mm / 1.0mm / 1.1mm / 1.2mm / 1.3mm/ 1.4mm / 1.5mm/ 1.6 mm, meet your various needs.
• Needle Files and bridge saddle file are all made of high-quality stainless steel, smooth and light weight, perfect tools for filing string slots into nut and bridge.
• Sand Paper Model: 9 pcs (3 pcs of 240 grit, 3 pcs of 320 grit, 3 pcs of 400 grit), for polishing saddle, nut, string and so on. 240 grit and 320 grit are used for coarse grinding. 400 grit is used for fine grinding, making the polish more smooth and delicate.