Victorinox Diamond Honing Steel 10-Inch Oval with Hollow Core, Black Plastic Handle by Victorinox. $41.75. Hand guard to protect hand while sharpening. Victorinox, makers of the original Swiss army knife, has been crafting fine cutlery since the later 1800's. The most valuable tool in any kitchen is a sharp knife. so maintain your edge. Victorinox Honing Steels are manufactured in Sheffield, England, to Victorinox specifications.