SHARPENING To re-sharpen your knife, use a whetstone at an angle of 15°- 20°. This will result in a cutting angle of 30°- 40°. If sharpening on a grinding wheel, always cool with plenty of water to avoid excessive temperatures and the resulting damages that may occur.CLEANING If the blades of knife begin to stick together, open and close the blades in warm water several times - this will allow the tools to move easily again. Once dry, apply a drop of Swiss Army Knife Oil between each tool and its spring. Do not put Swiss Army Knives in the dishwasher.HISTORY & HERITAGE In 1884, Master Cutler Karl Elsener opened a cutlery shop in Ibach, Switzerland. There, he and his cutlers? union produced the finest steel cutlery, finished with the now-famous proprietary edge preferred globally by professionals and home cooks. Karl supplied the Swiss Army with its standard issue Soldier?s Knife and Officer?s Knife. After the death of his mother, and with the advent of stainless steel, Karl changed the name of the company to Victorinox. It is from those humble beginnings that a worldwide icon was born. Today, Victorinox is still owned and operated by the Elsener family, and both the company and family still resides in the small village of Ibach, Switzerland.EVERYDAY SUPERHERO Compact enough to fit in your pocket or attach to your keys, the 2¼" Classic SD is the epitome of a Swiss Army Knife; foldable, versatile and always there when you need it. Featuring 7 popular implements, stainless steel construction and Swiss-Made precision, the Classic SD is the perfect companion for everyone.FEATURES 7 FUNCTIONS:BladeNail FileScrewdriverScissorsKey RingTweezersToothpickCARE TIPS FOR YOUR SWISS ARMY KNIFE The steel is tempered, annealed and polished to achieve the necessary hardness and provide optimum resistance to corrosion.