Knife Sharpener. Can be used for standard or serrated edge blades. Black composition casing. Measures approximately 2 3/4″ x 2 1/2″ x 3/4″. Sharpen and whet with one device. Fits easily in shirt or pants pocket. Safe and easy to use. Leaves no scratches on the blade surface. Adjusts to the cutting angle. Sharpens without heat. Dishwasher safe.