Durable monocrystalline diamonds fine 600 grit (25 micron) coated onto 10cm / 4 inch in length round shaft and 9cm / 3.5 inch tapered rod 3-In-1: Round diamond coated rod for sharpening straight edge; Tapered diamond rod for sharpening serrations and gut hooks; Sharpening groove for fishhooks and pointed tools A handy, durable, portable knife and tool sharpener requires no water or oil Both round and tapered rod can be stored compactly in the aluminum handle when not in use. Easily take anywhere with lanyard hole and storage pouch An ideal companion for any knife enthusiast such as hikers, backpackers, anglers, hunters, hobbyists and carpenters