TEFAL place the sharpener on a stable surface during use; keep the blade centered in the slot and pull the blade from tip to base through the sharpening slot. Repeat the movement three times to sharpen on both sides. Safe to use: non-slip feet provide better stability and safety during use. Comfortable handle for better control and safety while sharpening. Note: excludes serrated blades, ceramic knives and scissors. Knife Sharpener