Chef's Choice 320 Diamond Hone Knife Sharpener, White
When your favorite knives start squishing ripe tomatoes instead of slicing  them, it's time to sharpen your blades. This knife sharpener is remarkably easy to use on  both straight-edge and serrated knives. Simply plug it in, turn it on, and feed knife blades  through the stages. The first sharpening stage uses 100 percent diamond abrasive disks to hone the knife's edge while the second stage incorporates polymer disks to polish and strop the edge to hairsplitting sharpness.  Straight-edge knives should go through both stages, while serrated blades should only be  used in the polishing stage.The internal elastomeric spring guides hold knife blades at just the right angle to the  sharpening surfaces, making sharpening easy. The instructions are easy to follow, and  maintenance is limited to removing the metal dust shavings from the clean-out tray once  a year or so; no lubrication is necessary for the motor, bearings, or sharpening surfaces.  Guaranteed not to detemper, the sharpener has a two-year warranty for home use.--Ariel Meadow Stallings