All files are diamond-coated on all sides.Mini Diamond Needle File Set includes 10 assorted shapes.
Diamond Coated Mini Needle Files Smooth and Shape Almost AnythingDiamond-coated files cut faster and leave a smoother finish than ordinary steel files. They'll work on wood, plastic, ceramics, metal, glass and just about anything else.Medium grit. And, because the abrasive is made of genuine industrial diamonds brazed to nickel-plated steel handles, they last far longer than ordinary steel files.