On Episode 667 of The Knife Junkie Podcast, host Bob DeMarco sits down with two of the most well-known brothers in the online knife community: Austin Culbertson, known on YouTube as Hissatsu5, and his brother Mathew Culbertson.

The Culbertson brothers have been making knife videos for close to 20 years, starting with water bottle cut tests filmed on a bad camera, and building their channels into trusted resources for knife owners who want to know what their blades can actually do.

One area of discussion in this episode is serrations and why they matter more than most people think. The brothers reveal that denim has a level 1 cut-resistance rating, meaning a razor-sharp, plain edge can bounce off denim without cutting through. Their testing shows that serrated edges close that gap and guarantee a bite that a plain edge sometimes cannot.

Mathew walks through the pros and cons of Veff serrations, Cold Steel serrations, and Spyderco serrations, and describes the custom large flat top serration pattern he has developed for his own carry knives. He also covers a single oversized serration near the tip of a tanto blade that boosts performance on snap cuts — what he calls the \"snap master.\"

The conversation includes why both brothers carry knives as tools of defense. Austin started carrying in high school after the Virginia Tech shooting. Mathew is a prison chaplain who cannot carry a firearm on the job and trains with knives every Sunday alongside his brother. Both brothers make a strong case for the knife as a practical carry tool, covering Texas self-defense law, the limits of firearms in restricted locations, and the ways a knife can save a life that a gun cannot.

Bob asks both brothers about the deeper pull that knives have on the people who collect and carry them. Austin points to the knife as the first tool humans made with real intention. Mathew describes it as a symbol of justice, truth, and the responsibility to protect others. The episode also features a long look at Bowie knife history, including trainer knives made by Bobby Raines, a tour of the Bowie knife exhibit at the Little Rock, Arkansas, Museum, and a discussion about how historical Bowies took very different forms across different regions and eras.

Find Austin Culbertson on YouTube at https://www.youtube.com/@Hissatsu5 and Instagram at https://www.instagram.com/p/DG4dLfrMvjz. Find Mathew Culbertson on YouTube at https://www.youtube.com/@mathewrculbertson and on Instagram at https://www.instagram.com/matrculbertson.

For the full episode and all show notes, visit www.theknifejunkie.com/667.

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