When you use the Aligner sharpening kit by DMT, you are sure to use a constant angle while sharpening. That is ideal to get your knives back to razor sharpness. The coarse-stone helps you to put a good edge back on your knives. Therefore, this DMT-sharpening stone is specifically suitable for knives which are pretty blunt. Always take into account that a diamond sharpening stone has to be made ready for sharpening. Only after 5 to 10 knives the stone works as intended.