Unique and first of its kind Angle Adjust(TM) knob that allows the user to adjust the angle of both the coarse and fine sharpening slots at the same time. Two adjustable manual sharpening slots: Coarse featuring diamond rods to sharpen dull and damaged knives. Fine offers ceramic stones for finishing the edge and light touch ups and is ideal for polishing the edge of an already sharp knife and for everyday knife maintenance. Serrated knives are easily sharpened in this fixed angle ceramic slot, just a few pulls is all it takes to sharpen most styles. Soft touch hand grip; Non-Slip base for added stability and safer sharpening Easy to use, simply select the correct angle by pushing and turning the knob