Ruko Diamond Sharpening Pen 4"

A diamond rod that collapses into something about the size of a marker and clips into a pocket. The rod pulls out and locks into the handle, so you get a real grip instead of pinching a short stub while you work an edge back.

Diamond cuts dry, with no oil or water to carry along, and it bites on the hard stainless blades that give a natural stone trouble. This is a field sharpener meant to bring a dulled hunting or fishing knife back to a working edge, not a bench setup for polishing. Follow with a finer stone at home if you want more refinement than it leaves.