SE 74336DF Flat Diamond Flat File for 40 to 600 Grit (6 PC.) Hard-to-find flat diamond files with heavyweight 3mm thick blades Set of six 10mm by 8-1/2-Inch files embedded on four sides, heavy-duty steel with chrome finish Includes one-each in grits 40, 80, 150, 240, 400 and 600 for coarse to extra-fine filing PVC-dipped handles are easier on hands and provide non-slip grip; 3-Inch filing surface Nature's hardest material works on hardened steel, glass, granite, tile