Aligner™ Easy Edge-Guided Sharpening System provides the components for guided strokes, exact edge bevel and consistent angles, producing the ultimate in fast, accurate knife sharpening. Aligner™ Kits include the interchangeable stone holder, blade guide and one, two or three 4" Diamond Whetstone™ sharpeners. Models offer different options - one with a rugged carry case, others with fabric storage pouch.