Tumbler Rolling is your ultimate knife sharpener, making your blades as sharp as the day you bought them. The set features diamond sharpening stones with a D35 grit, effortlessly restoring blade sharpness. A special stainless steel spiral disc removes burrs, leaving a perfectly honed edge. Choose your sharpening angle—15 or 20 degrees—and simply roll the disc back and forth until your knife is razor-sharp. A professional result in minutes with no extra effort!