Furi Tech Edge 2 Tri-Fingers Professional Sharpening System Professional double-bevel edge on all your knives including classic Chef, Paring and Santoku knives. Stage 1 Full Regrind Fingers creates a thin and sharp 30 shoulders Each of the Tech Edge 2 sharpening components slotted into and out of the innovative folding handle A guard protects the hand from injury from any accidentally miss-guided cut Traditional stone or grinding wheel, or a regular diamond steel or a traditional hard chrome steel all in one system