A precision double sided credit card size diamond stone double sided combination of two grade of fine grit designed for carvers and precision honing of keenest edge fine 1000 grit 15 micron and 600 grit 25 micron continuous diamond complete with storage wallet guaranteed for five years use with lapping fluid ideal for fluted shaped small turning and carving tools dimensions size85 mm x 50 mm x 1 5 mm gradefinefine grit1000 600 nom 15 25 micron