The two-stages of this manual knife sharpener will put a longer lasting edge on both straight edge and serrated blades. From tip to handle, the blade is honed by 100% diamond abrasives in two stages, each set at different angles to create razor-sharp edges that stay sharp longer. The precision roller guides insure an accurate angle control for foolproof sharpening. The Chef's Choice Model 460 can be used by right or left-handed. Comes wtih a dust cover to protect sharpening mechanism.