The most carried EDC is also, statistically, the most neglected one. Pocket knives get used daily and sharpened almost never, because the sharpening step requires a separate tool that most people don’t carry. Bench stones are too large. Pocket rods are awkward. Folding sharpeners add bulk and usually deliver mediocre results on any blade worth maintaining. The gap between “I should sharpen this” and “I have what I need to sharpen this, right now” stays wide for most knife carriers, and a dull edge is the tax they pay for it.
SHARPAL’s answer to that gap is the 113N, a sharpening stone built to credit-card dimensions so it lives wherever your cards live. The stainless steel base measures 3.5 by 2.12 inches and runs just 0.13 inches thick, making it genuinely wallet-compatible rather than merely wallet-adjacent. Industrial monocrystalline diamond abrasive is electroplated across the working face at 325 grit, a coarse cut that restores real edges rather than just polishing ones that don’t need it. A folding ring grip on the back keeps your fingers clear, and a mirror-polished reverse doubles as a signal reflector when the situation calls for it.
Designer: Sharpal Inc.
Using the 113N in the field is a straightforwardly satisfying experience. The ring grip deploys with a simple fold, slipping over your middle finger and holding the card firmly against your palm while you work the blade across the surface. The contact feels authoritative in a way that smaller pocket sharpeners simply cannot replicate, because the working surface is large enough to take full strokes on a 3 or 4 inch blade without having to reposition mid-pass. The dry sharpening design means no oil, no mess, no preparation ritual, which matters enormously when you’re using it at a campsite, on a trail, or standing over a cutting board somewhere inconvenient. Steel swarf wipes off with a cloth, and the surface stays flat because there’s no hollow ceramic or soft bonded matrix to wear unevenly.
The abrasive choice separates the 113N from the pile of cheap credit-card sharpeners that populate the lower end of this category. Monocrystalline diamond means each abrasive particle is a single uninterrupted crystal structure, harder and more consistent than the polycrystalline alternatives found in bargain products. SHARPAL electroplates those crystals in nickel directly onto the stainless steel substrate, which keeps the surface flat and bonded over repeated use. The 325 grit rating places this firmly in coarse territory, 45 microns per particle, suited to reestablishing a proper edge bevel on a blade that’s gone genuinely dull. For finishing work or touch-ups on a maintained edge, SHARPAL also offers the same card format in 600 grit (114N) and 1200 grit (115N), and the three-pack of all three grits is one of the better value propositions in the entire sharpening category.
That’s just one side of the 113N, on the flip side of the abrasive knife-sharpener is a mirror-finish that has a unique feature. Any polished metal surface can redirect sunlight for emergency signaling, making it incredibly useful in a pinch. Sure, it’s not the primary reason to buy the 113N, but it’s a well-considered detail that fits the ethos of a tool designed to be carried rather than stored. The tan leather pouch included with the card completes the package in a way that feels considered rather than obligatory, protecting the abrasive face and giving the card a home inside a jacket or bag pocket.
The 113N lists for around $10 on Amazon for a single card, or $27 for a 3-pack that includes all three grits. Carrying the 113N alongside a decent folder like the Civivi Elementum or the Vosteed Vombat turns a passive carry into an active one, meaning the blade you grab in a pinch is actually sharp enough to matter. The one thing I’d love to see in a future revision is a dual-grit version with 325 on one face and 600 on the other, eliminating the need to carry two cards for a complete field sharpening session. Until then, the three-pack remains the obvious answer.