The MusicNomad MN850 Diamond Coated S-File is a revolutionary tool designed for guitar luthiers and enthusiasts. Its patent-pending Safe Zone feature prevents over-filing, ensuring precision and ease of use.

Users rave about its ergonomic design, with a comfortable silicone grip that reduces hand fatigue. The 240-grit diamond coating cuts efficiently in both directions, making it faster than traditional toothed files.

Many reviewers highlight its foolproof nature, especially for beginners. The tool's weight and balance contribute to a professional finish, whether crowning entire frets or spot-leveling.

While priced at around $100, most agree it's worth the investment for the time and effort saved. It's particularly effective on nickel silver frets, though stainless steel may shorten its lifespan slightly.

Compared to competitors like StewMac's Z-File, the S-File offers better value at $79.99 while delivering comparable results. Its wider contact surface makes it ideal for quick jobs, though some professionals still prefer narrower files for precision work.

The included hang hole and engraved size indicators add thoughtful touches to this well-designed tool. Whether you're a seasoned luthier or a DIY enthusiast, the S-File simplifies fret work while delivering professional-grade results.