Phoenix 140mm Diamond Files for Guitars Nut, Saddle and Pick Guard Tuning, Set of 10 A set of 10 types of diamond files including circular/semi-circular/triangular/knife edge/square/elliptical and more. Except for the flat file, all files are tapered to a fine point. It is useful for the fine tuning of the nut, saddle, and pick guard, and also for precise work on iron, ceramic, and glass. (Finishing touches should be done with fine/extra fine sandpaper.) Each file comes with an easy-to-handle plastic grip. Safe and secure with a long-term written maker's guarantee (45 days). If by any chance you are dissatisfied with the product, please contact customer service. We will soon issue a refund or send a replacement product.