Cool HandZirconia Ceramic Utility Blade, Replacement Blades, Box Cutter, 6 Pcs per Pack, Stanley Knife Good Choice for Unwrapping Parcel Cutting Paper

I use my utility knife a lot, and I abuse it like my parents abused me. (That is to say, my knife definitely needs therapy.)Hopefully the photo attaches to the review, this one blade is ~5 months old and is used VERY regularly.I moved over to a ceramic blade wanting to try it out as I do not generally require razor sharp precision, I just need it to be sharp enough to cut straight-ish. I mostly am cutting up a lot of cardboard, plastic, tape, etc. I avoid using this on anything hard like a wire since it has a tendency to chip, use a metal blade for that.These blades are a little bit thicker than the metal ones, so be aware of that if the metal blades are already very snug in your knife.I was probably flipping my metal blades at least every 2 weeks, it took me about 3 months to need to flip this one. It was still sharp enough, but the chips in the blade were getting a bit too bad.

These are a winner!! Perfect fit for Oknife U1 and they look great too. Very sharp!!! A six pack for this price was a no brainer.

Super sharp... But not as strong as metal. Will break with any sideways pressure. (Duh). Aside from that. Cuts great. Lasts a while. O and did I say doesn't rust

Wow, these blades are high quality and very sharp! Be careful!

Positives:Very Sharp blades and slice through most materials without any trouble.These are great blades for certain applications.Being ceramic they are non-metallic so great for added peace of mind when working near electrical. These also won't rust so they're great for working in wet environments.Cons:-These are NOT comparable to the SLICE brand ceramic blades. These are much sharper and WILL cut you with the slightest contact.-These are very brittle and prone to breaking. Do not even try to use them in any way other than slicing. Don't use them near hard materials as pieces will break off. And be very careful if handling near any materials that you can't risk tiny fragments falling into.

I first(and last) purchased these on Feb 26, 2023. Me and my girlfriend both use these. I bought the six pack and currently have 1 left brand new, 1 used and we both have 1 in our box cutters.Of the 6 pack, we still have 4. My girlfriend used it incorrectly and broke one blade the first day she used it. 6 months in, I broke a blade dropping my box cutter. Today I just chipped on end of one side of the blade.I'd say the 15 dollars more than paid for itself. I use to use dewalt carbide which I can get a 5pk for about 6 bucks. Changing the blade bi-weekly, I would have spent around $25 in a year. Nothing crazy to break the bank, but I can easily see these lasting me at least until Feb 2025, meaning I would have spent another $25, making these come out as saving me $35 bucks. If you're careful with your tools, I can easily see this lasting a very long time.

These are sharp, but are not flat, and the size of the blade varies from blade to blade. I was planning on using these for some products I sell for scraping, but the fact that they are not flat, they don't work well.I contacted the mfg and they were less than helpful. I asked about what kind of quality control they have and about the flatness of the edge and I was basically told too bad and try and get a refund.......Guess I'll check out another companyEdit: Update to 3 stars because they are sending replacements.

I wouldn't use these for heavy duty utility, one side of the blade lasted for 2 sheets of drywall. Wasn't impressed, but cutting ground up rock with a thin ceramic blade was bound to be mangled up. However, cutting everyday things like paper & fabric, these excel. I use them for cutting leather, fabric, and cardboard, and I'm still using the same blade after trying to abuse it. Be careful, they are the type of sharp where you can cut yourself without feeling it.