The Sisal Wheel is used alongside the Grey Compound in the first stage of honing your knives. It is also used for sharpening your rasps, and if used daily from new can extend their life by up to 4 times! It is attached and removed quickly and easily to the Spiral Tapers. Available in different widths for ease of use. The 1/2″ section mop is recommended for knives, the 1″ and 2″ section mops are recommended for rasp sharpening.