Fine Grade Diamond Sharpener, 45 Grit/ OVERALL LENGTH: 3.250 INCHES NOMINAL OVERALL WIDTH: 2.000 INCHES NOMINAL OVERALL THICKNESS: 0.050 INCHES NOMINAL STONE STYLE: 24 SHARPENING PART NAME ASSIGNED BY CONTROLLING AGENCY: SHARPENING PLATE DIAMOND DIASHARP CREDIT CARD SIZE SPECIAL FEATURES: ELECTROPLATED WITH 25MICRON/600 MESH MONOCRYSTALLINE DIAMOND; USE TO SHARPEN, HONE, OR ABRADE ANY MATERIAL; FLAT, VIRTUALLY UNBREAKABLE, USE DRY OR WITH A FEW DROPS OF WATER; CREDIT CARD SIZE WITH CONVENIENT VINYL COLOR-CODED CARRYING CASE