The Messermeister 12-in. Slicer Edge-Guard is an ideal fit for slicing knives or slim blade knives 12-in. in length or less. The exact dimensions are 12.5-in. long by 0.9375-in. wide. If your knives are not stored in a block or you carry them around in knife luggage, edge guards are a must for the knives you want to take care of. Not dishwasher safe.