A precision double sided credit card size diamond stone fine 600 grit 25 micron coarse 300 grit 50 micron complete with black storage wallet guaranteed for five years ideal for fluted shaped small router bits carbide or hss turning tools chisels plane blades carving tools all general tooling whats included1 x credit card stone1 x wallet specifications size85 mm x 50 mm x 08 mm grade fine course grit600 300 nom 25 50 micron