Furi Tri-Fingers 3-Stage 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 Professional use by simply bolting the Tri-Fingers Bracket to the top or side of a commercial counter and using the 3-Stage System No mess: no oil or water required unlike traditional stone sharpeners Professional restaurant chefs, commercial kitchens and culinary schools continue to switch to Furi Professional sharpening tools