Rynoblade Knives RUKO RUK0040-CS 4 in 400 Grit Diamond Sharpening Pen

The Rynoblade Knives RUKO RUK0040-CS Diamond Sharpening Pen is a compact, pocket-sized sharpening tool built around a 4" retractable rod coated in 400 grit diamond. It is designed for quick field touch-ups on knives, tools, and fish hooks, making it a versatile companion for hunters, anglers, and everyday carry users.

Two sharpening profiles are built into the rod: a rounded edge for plain knife edges and a flat edge for chisels, broadheads, and thicker tool steel. A small groove is shaped to dress serrated edges and fish hooks, rounding out the pen as a true all-purpose sharpener.

The rod retracts into a slim pen-style housing for safe carry, and an integrated pocket clip keeps it secured in a shirt or pack. At just 2.40 oz, it disappears in a pack or on a lanyard. Backed by the RUKO Lifetime Warranty.