Double Sided. Measures approximately 7 7/8″ x 2″ x 1 1/2″. Just a few light pressure strokes produce a sharp edge. Lubricate with a small amount of oil. One side is 240 grit, the other 320 grit. Perfect for do-it-yourself projects. Easy and convenient to use. Correct blade angle and knife sharpening instructions are printed on the back of the packaging. Hang packaged.