Safety Technology Credit Card Foldable Knife – 2.75-Inch 440 Steel Blade, Blade Lock Safety, Wallet-Sized, 0.1 lbs, Fits in Any Card Slot, Always-Ready Pocket Knife Disguised as a Credit Card

SKU: ST-CCKNIFE
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$4.95

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It’s exactly what it sounds like — a knife that lives in your wallet. Card-sized, black, sits in any card slot, and folds out into a usable pocket knife with a 2.75-inch blade. The blade lock keeps it closed until you pop it open intentionally. Surgically sharp 440 steel. At 0.1 lbs, you won’t notice it’s there until you need it.

  • 2.75-inch 440 steel blade — sharp out of the box, holds an edge well
  • Credit card dimensions — fits in any wallet slot or coat pocket, no bulk
  • Blade lock safety — stays closed until you choose to open it
  • Lightweight at 0.1 lbs — genuinely easy to carry every day
  • Measures 3.38″ x 0.13″ x 2.13″ — credit card dimensions, about as thick as a few stacked cards

A Knife That Fits Where Nothing Else Does

The appeal of the credit card knife is simple: it goes where a folding knife can’t. Doesn’t bulk up a pocket, doesn’t print through a jacket, doesn’t add weight to a bag. It just sits in your wallet with your cards and disappears. When you need it, pop the blade lock and fold it out. That’s about as low-maintenance as a knife gets.

The 440 stainless steel blade comes sharp and stays sharp with basic maintenance. At 2.75 inches, it’s the right size for practical tasks — cutting rope, opening packages, slicing fruit — and it folds back flat when you’re done.

Who This Knife Is For

People who want a knife with them but don’t want to deal with a folding knife clipping to a pocket or adding weight to a bag. If you’re the kind of person who carries a wallet and forgets everything else, this just lives there with your cards. No thought required.

It’s also a reasonable option for travel — compact enough to slip into luggage without taking up space, and low-profile enough that it doesn’t look like anything at a glance. Hikers and backpackers who want a true backup blade appreciate the wallet carry. And honestly, people who are just curious about it and want something a little different at five bucks are going to like it too.

Worth noting: this is not a replacement for a full-size fixed blade or heavy-duty folding knife. It’s a light utility knife that happens to carry like a credit card. That’s exactly what it’s designed to be.

Is This the Right Choice for You?

Choose the Credit Card Knife if you want:

  • A knife that lives in your wallet and weighs nothing
  • Something low-profile that doesn’t print or add bulk
  • A solid backup blade for travel, hiking, or everyday utility tasks
  • An affordable entry point with good-quality 440 steel

Consider something else if you need:

  • A heavy-duty blade for hard-use tasks — this is a light utility knife
  • A locking blade for safety-critical work — the fold-out design is not a liner lock

How It Actually Works

The knife ships in its card form — flat, black, looks like a plain credit card with some texture. The blade lock holds everything in place. To deploy it, you release the blade lock and fold the blade section out at a right angle to the handle section, which creates a usable grip. It takes a few tries to get the motion natural, but after that it’s quick.

The 440 stainless steel blade is a reliable workhorse steel — it sharpens easily, holds an edge reasonably well, and doesn’t rust with normal care. At 2.75 inches, it’s within legal limits for most carry situations, though local blade length laws vary and it’s worth knowing yours.

Quick Comparison: How Does the Credit Card Knife Stack Up?

Feature Credit Card Knife Standard Folding Knife Fixed Blade Knife Multi-Tool with Blade Pepper Spray
Carry Profile Wallet-flat ✓ Pocket clip Belt sheath Pocket / pouch Keychain / pocket
Blade Length 2.75 inches 2.5–4 inches ✓ 3–6 inches ✓ 2–3 inches N/A
Weight 0.1 lbs ✓ 2–6 oz 4–10 oz 4–8 oz 1–3 oz
Concealability Excellent ✓ Good Poor Moderate Good ✓
Utility Tasks Light tasks ✓ Moderate-heavy ✓ Heavy ✓ Varied ✓ None
Best For Wallet carry, travel, backup blade Everyday utility, general carry Outdoor, hard use Camping, general utility Non-contact personal protection

Practical Details

The Credit Card Knife measures 3.38″ x 0.13″ x 2.13″ — nearly identical to a standard credit card in width and height, just slightly thicker. It weighs 0.1 lbs. The blade is 440 stainless steel at 2.75 inches. Blade lock keeps it closed during carry. At $4.95, it’s an easy add to a wallet, bag, or travel kit.

Flat, light, always there — the credit card knife is the kind of tool that earns its slot in your wallet the first time you actually need to cut something and didn’t bring anything else.

Frequently Asked Questions

Is this actually the size of a credit card?

Very close. It measures 3.38″ x 2.13″, which is just slightly larger than a standard credit card (3.37″ x 2.13″). The thickness is about 0.13 inches — thicker than a single card, but it fits in most card slots without a problem. It won’t bulge your wallet noticeably, especially in a standard billfold or travel card holder.

How do I open and use it safely?

Release the blade lock, then fold the blade section out perpendicular to the handle card section. The two sections lock at a right angle and form a T-shape grip. It takes a minute to get used to, but it’s intuitive once you do it a couple of times. Always fold it back into card form before returning it to your wallet, and make sure the blade lock is engaged.

Is it legal to carry in a wallet?

In most places, yes — the 2.75-inch blade falls within common legal limits for folding knives. That said, blade carry laws vary significantly by state, county, and city, and some locations restrict concealed carry of any bladed instrument. Know your local laws. It’s also worth noting that while it looks like a credit card in storage, it’s still a knife, so discretion applies.

How sharp does it come, and can it be resharpened?

It comes sharp out of the package — 440 stainless steel takes and holds a decent edge. Over time, with regular use, it will dull like any knife. It can be resharpened with a standard whetstone or pull-through sharpener. The blade profile is simple enough that sharpening is straightforward, even if you don’t have a lot of experience doing it.

ColorBlack
Blade Length2.75 inches
SafetyBlade Lock
Weight0.1 lbs
Dimensions3.38" x 0.13" x 2.13"

Additional information

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