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5 hole double sided razor blade In the knife

I have this razor blade knife that I cannot find replacement blades for. I love the knife but I don't even know what to search for.

What are these blades called and where can I get them?

The metal handle has martor-handy Inox no. 444 Solingen Germany on it.

  • Have you gone to the utility knife section of the hardware store and looked ? – Alaska Man Sep 14 '19 at 22:01
  • Shopping questions are off topic, are there any markings on the holder? Like a brand name. I have not seen that style knife. – Ed Beal Sep 14 '19 at 22:02
  • Looks a lot like a standard "old style" razor blade (for shaving) would fit, but the present blade is a bit different from that. – Ecnerwal Sep 14 '19 at 22:13
  • @AlaskaMan that's the first thing I've tried. Also "5 hole razor blade" on Google. I didn't think to look for a name on the tool itself, will update with that info – Wayne Werner Sep 14 '19 at 22:27
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Thanks to Ed Beal, I looked at the name on the tool. That also led me to take a scouring pad to the blade itself and lo and behold it's a Cartonax 45 Cartonax 45 blade

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That looks vaguely like a regular safety razor blade. I'm a bit dubious as to the dimensions, though. I measured mine at 1 12/16" x 14/16", with holes 5/16" from each end. If those (approximately) match your blade, and both sides are sharp, it's probably it.

The main reason I doubt this is that most safety razors are a bit shorter on the blade ends than the middle, while utility razors aren't.

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looks like this one.

https://www.amazon.com/Metal-Safety-Cutter-replacement-blades/dp/B01EPE7LJO/

I searched "box cutter"

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