YSTD&reg; Outdoor Portable Professional Pen Diamond Knife Fishhook Sharpener Multi Purpose Size: 14cm (diamond dust sharpener) ,23cm (included hand shank ) Usage: general sharpening jobs, hunting, outdoor exploration, fishing etc. Pocket knife sharpener with fine grit that features a D-shaped sharpening area with a groove for fish hooks Keep one in your tackle box, tool box and the kitchen drawer Type: pen-shape, pocket