Multi-angle knife sharpener 20° / 25° / 30° / 35° depending on knife type. two functions: coarse (tungsten carbide): restores the edge and fine (ceramic / resin diamond): fine and durable finish. ergonomic adjustment wheel for one-handed angle selection. non-slip silicone base for safety and stability. comfortable and ergonomic design, designed for an easy user experience. includes recycled paper bag with zip closure. compatible with all metal blade knives (not suitable for ceramics)