Work Sharp WSSA00033300 Upgrade Kit Intended for use with the Work Sharp Guided Sharpening System (WSGSS sold separately) Expand your Work Sharp Guided Sharpening system to repair damaged blades, sharpen a wider range of tools, or create the ultimate cutting edge! The Guided Sharpening System Upgrade Kit includes two additional Diamond Plates The Diamond Plates and Leather Strop are 6" x 1.25" and are designed to fit the Guided Sharpening System