The Diamond Cams High Tech Pro is an easy-to-use knife sharpener from de Buyer that provides professional-grade results. The knife sharpener has been specially designed to provide the optimal angle to sharpen the knife without over-grinding. To use it, simply place your hand behind the sturdy guard, then centre the knife as you pull it back and forth three times. Repeat with higher pressure to create a sharper blade, finishing with three light moves.