Lansky Sharpeners Eraser Block Knife Sharpener. The Eraser Block is used to clean the metal filings which accumulate during the sharpening process on the alumina ceramic Crock Stick sharpening rods. Proper rod cleaning with the Lansky Eraser Block maximizes sharpening efficiency. The Lansky Sharpener Cleaning Block can also be used for cleaning metal and sports equipment. Take care of dirty sharpening stones with this handy cleaner. Specifications for Lansky Eraser Block - for cleaning sharpeners: Manufacturer: Lansky Sharpeners Blade Material: Steel Features of Lansky Eraser Block: Cleaner for sharpening stones Keeps stones at maximum efficiency Prolongs blade life Package Contents: Lansky Sharpeners Eraser Block Knife Sharpener Lansky Sharpeners LERAS: Eraser Block Knife Sharpener