This is 155mm long diamond-coated sharpener tapers from 28mm at the handle to 4mm at the tip. The overall length including the handle is 270mm. The diamond grade is a fine 400 grit; this sharpener produces a keen edge. Used regularly the sharpener will help maintain that fine edge for a long period. One side is rounded, ideal for sharpening kitchen knives, penknives and similar blades. The rounded cross-section offers you a larger surface giving you quicker results. The other side is flat, useful for scissors, shears or general sharpening. The flat side features a central groove for sharpening pointed tools. This diamond sharpener can help restore an edge of a dull knife for smooth, easy cutting. The wooden handle provides a secure grip and a hanging hole lets you store the sharpener in a convenient place.