A revolution in sharpening : not only a flint, but with 5 stages for professional sharpening and polishing. QUINTUM 'HyperSteel' allows to sharpen both professional and home knives. - CamsTM Registered diamond, ergonomical handle for an easy grip during sharpening. - 5 sharpening stages: First stage sharpening with diamond layer grain 400 inclination 15° From second to fifth stage (numbers indicated on handle) polishing of cutting edge up to obtaining a perfect sharpening. Total length 45 cm. Sharpener thickness 3 cm.