It's the quality and sharpness. Twenty times better than any snap off knife in the box stores.

Maravilloso y funcional para lo que está diseñado.

18mm Snap off utility knife
The quality of this utility knife is exceptional, Japanese are really skeptical about what they're doing. I love it!, all metal construction except only 2 things! Although this knife is great it could be much more better IF ratcheting lock wheel knob should be metal too but it is plastic, and the blade snapper is also Plastic as well but the rest of the knife are all metal. Overall it's a great knife, great quality Japanese made utility snap off knife versus the Chinese imitations, copied and replica ones. One thing for sure! I have to use and abuse this knife to find out if it last! My 17 year old Japanese made retractable utility knife is still working though but it's not a snap off like this one. I highly recommend this cutting tool. â­â­â­â­â­

This is the best snap-blade utility knife that I've used. Funny, yesterday I was discussing how much I like this tool with a friend over lunch. My friend said that he really likes the Lennox Tradesman Locking Utility Knife, also sold by Amazon. (When I remember how to link to Amazon products within the page I will update with the link.) We have different needs: he owns an HVAC company and puts his knife to heavy use. Professionally, I am an electrical engineer and my hobby is woodworking. I also use the Utility Knife for home projects. My friend needs a strong blade; sharpness is less critical for his purpose. I need a sharp blade; there are different tools I use for heavier cutting.

Pros
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+They mean it when they say "Locking". Unlike other utility knives I've used, the blade will not slip in this one.
+Integrated blade snapper. The red plastic end-plug has a slot the fits over the blade tip like a shoe, covering the point and exactly the right depth to snap off the old blade.
+Feed good in the hand.
+Stainless construction.
+Easy blade changes.

Cons
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-The blade snapping slot in the red plastic end plug could be marked so that it is easier to see: I struggle to see a -The gray color looks cool, but makes the tool more difficult to find inside my tool bag.

Comparison
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At this same time I bought the NT Utility Knife, I also bought an OLFA 5003 L-1 18mm Ratchet-Lock Heavy-Duty Utility Knife, also from Amazon. This blade will stay locked, but only after you take several turns on the thumb wheel. They use interchangeable blades.

I have had many snap blade knives and this is by far my favorite. It looks good and feels good. I some how lost my first one and immediately reordered.