1. attaches anywhere with suction cup, No tools!
2. sharpen lawn mower blades without removing
3. sharpen hardened knives.
AS SEEN ON TVKnife Sharpener Product FeaturesInnovative knife sharpener; easy-to-use; have a perfect edge on any bladeUse on kitchen cutlery, gardening shears, lawnmower blades, serrated knives and moreDiamond precision hones the blade to its proper angle; patented design produces results that are superior to those from traditional steel or stoneRemoves only microscopic amounts of metalUnique round design and PowerGrip suction bottom makes it easy to use
World's Best Knife Sharpener