Take care of your tools, too, by sharpening your plane blades, perhaps with the 8" Diamond Tri-Hone, model #500008, this year’s addition to the line of sharpening tools from Smith’s®, a company that’s been around since 1886. Two Interrupted Surface Diamonds include a Micro-Tool Sharpening Pad for sharpening small edges and tools. The stones in this offering include 8" x 2-1⁄2" versions of both fine (750-grit) and coarse (325-grit) diamonds and a natural Arkansas stone. The triangular stone holder has knobs on the ends for easy stone rotation. As of 2009, the cost is $74.99.