The JAG SP Hook Sharpening Stones are designed to give specimen anglers a reliable way to restore and refine hook points. Sharpening hooks to a surgical standard takes practice, but the tools themselves are often the limiting factor. These stones, developed by JAG Products, come in two grades and are intended to be used alongside the JAG Ultra Eye to produce points that are sharper than most hooks straight out of the pack. Rather than discarding blunt hooks and complete rigs, anglers can re-sharpen them, extending the life of expensive rig materials. - Medium grade: ideal abrasive for general sharpening - Fine grade: perfect abrasive for smaller hooks or final honing