Based off the old Vietnam era sheath for the 18" Ontario, U.S. Military machete. Fits the 18" machete perfectly. Super tight retention. Works well. VERY tight for an 18" Tramontina, Latin design. The more pronounced curvature on the Tramontina is a bit too pronounced to make a good fit for this sheath but it still will fit if pushed into the sheath hard enough.

I'm not sure about any other 18" machete but it will fit both the Ontario and Tramontina (tightly).

Great replacement for the cheap floppy sheath that came with my Harbor Freight machete

This is THE sheath for your 18" machete. Fits my old military issue machete that I originally bought at an army navy store about 18 or so years ago. I have been looking for a nice sheath that isn't too bulky and waterproof. The sheath is as slim and low profile as can be, nice little loop on the top that works as a dangler carry option. I bought the coyote brown and I would pretty much call it an olive drab color with a hint of brown. Very happy with the color, not too brown like some "coyote browns" out there. The material is a flexible impact resistant plastic that has many drainage holes through. Very nice upgrade and inexpensive purchase. Would recommend without hesitation to someone looking for a sheath like this.

Prevents me from grabbing the sharp part while not in use.

This is a nice sheath for a machete. Way better than a canvas one. My only complaint is that where the belt hardware is the bolt top rubs on the blade when insert and taking the machete out. If you have a black blade it will scratch it. If you have a metal blade it's metal rubbing on metal. It may not be a big deal to some people but it is to me. I'm a huge Rothco fan. I've had a lot of their stuff over the years. They are good value for the quality. This meets all those parameters it's just a simple design flaw. I put a small piece of Kevlar tape over the bolt head so the metal wasn't rubbing. You could also just take the belt clip off if you don't plan to wear it.