Ontario sharpening stone, replacement sharpening stone for the Ontario 499, O6151

The Ontario sharpening stone is a small sharpening stone, ideal for sharpening on the go. It is lightweight, and because of its size, you can put this stone in almost any pocket and behind any zipper. This sharpening stone is the replacement sharpening stone for the sharpening stone in the sheath of the Ontario 499 Air Force Survival Knife OKC 6150 survival knife. But of course, the sharpening stone can be used on almost any knife!