The Trend CR/DWS/F4/FC is a 4 inch double sided diamond stone with folding handle and monocrystalline diamonds for fast, clean, stock removal which gives excellent sharpening performance. It is double sided for coarse sharpening and fine honing: Coarse 360 grit (nom. 40 microns) and fine 600 grit (nom. 25 microns). The Coarse is ideal for carpentry as it rapidly fixes or restores a damaged edge or blunt tools, including chisels and plane irons. The Fine is ideal for cabinet making for a fine finish and refines the cutting edges of chisels, small blade, etc - achieves a razor edge in seconds. With plastic ABS folding handle, that folds to protects diamond surface and oval holes design to collect and hold metal residue. Ideal for saw blades, chisels, blade, domestic and garden tools. Recommended use with Trend lapping fluid to prevent clogging or rusting and assist in keeping tools clean.