The EZE-LAP Diamond needle files are optimal for engineering, woodworking and DIY sharpening tasks due to their high-quality diamond surface. These files are 1/4 inches thick, featuring a diamond surface on a robust stainless steel substrate. The ergonomic soft-grip handles are color-coded to indicate the grit level - red handles denote fine grits, while purple handles signify coarse grits. The files are provided in a protective pouch. Professionals such as gunsmiths, tool and die makers, jewelers and stock makers depend on EZE-LAP needle files for precision work. EZE-LAP offers twelve distinct shapes of diamond needle files. Utilizing an EZE-LAP product ensures high-quality and consistent finishes on tools. No oil or water is required and the surface remains true and flat. Manufactured in the USA with high-quality standards