【Advanced Sharpening System】: This set comes with sharpening stones of different grits—240#/600# stones for coarse sharpening, 1500# stone for honing, and a 3000# stone for polishing, whether your knives are dulled or chipped, ensuring your blades regain their fine edge and luster 【5 Angle Magnetic Base】: The base has five angles, namely 12/15/18/20/22°, which can be used for most knife sharpening needs in daily life. Roller knife sharpener can better avoid scratches when sharpening knives 【Simple and Effective】: Simply choose your angle and use the magnetic knife holder to secure your blade. Then, roll the sharpening disc back and forth until sharp 【After-sale service】: If there is any use of the problem, you can feel free to contact us, we will give you a reply as soon as possible to deal with your problem! Black Rolling Knife Sharpener with 2 Diamond Disc , Professional Rolling Knife Sharpener Kit with 5 Magnetic Angle Offer 12/15/18/20/22° for Kitchen Knives