1.Adjustable design: the 4in1 knife sharpener with 6 levels individually adjustable, the knife sharpener simple adjustment knob allows sharpening at a variety of angles (14°, 16°, 18°, 20°, 22° and 24°). Professional knife sharpener, you can sharpen your knives at the right sharpening angle, keeps your blunt knives sharper in a quick and effective way. 2.4stage knife sharpener: the knife sharpener has 3 knife sharpening slots and integrated practical scissor grinder, tungsten carbide for coarse grinding, diamond grinding for the surface for sharpening, ceramic stone for polishing to get a particularly sharp surface. Professional knife sharpener exceeds classic knife sharpeners in efficiency and performance. 3.Easy to use: our knife sharpener ergonomic handle design for maximum . Whether you are right or lefthanded, it allows you to simply place the blade in each of the slots and gently pull the knife through your different ones 35 times. (Note: knife sharpener not for serrated knives) 4.High quality : the professional knife sharpener is made of excellent ABS material. The manual knife sharpener nonslip silicone base on the bottom, does not slip easily when sharpening, and laboursaving.