The diamond stones are nice, but if you need to re-profile, and do not want to spend a fortune, get some coarse wet/dry sandpaper and wrap it around the ceramic sticks that come with the Sharpmaker... Use those big spring clips that you get at the office supply store to clamp them on the 'edge' parts of the rods... Do not use the edges to sharpen with the sandpaper...I wish someone would sell replacement rods with clamps already built in for use with the Sharpmaker... Sandpaper works MUCH better for the initial sharpening!!!