Smiths Diamond Sharpening Stone 4" w/Cover 4 in diamond sharpening stone;Interrupted surface captures filings for faster sharpening;Fine 750 grit diamond abrasive;Micro-tool sharpening pad for tips and small tools;Straight-line groove for hooks and pointed objects;Cover doubles as base extension during use;Lightweight and compact design;Suitable for small to medium knives and everyday carry bladestable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Second Color: Silver Item Category Code: 8400 Product Group Code: 8400B Inactive: No