A dull knife is dangerous — requiring more force, slipping unpredictably, crushing food. Traditional whetstones require skill. PROGRADE's guided two-stage system eliminates the learning curve. Stage one (coarse) repairs damaged edges; stage two (fine) hones to razor sharpness. Non-slip rubber base prevents sliding — a genuine hazard with cheaper sharpeners. Under 30 seconds weekly extends the life of your entire knife collection.