UC3172 United Cutlery Sentry Trench KnifeThe UC3172 Sentry is a fixed blade trench knife built for utility and self defense, featuring a 6. 75" black stainless tanto blade with a cast metal knuckle guard and integrated glass breaker. The FRN handle offers a secure grip in wet conditions, while the overall 12. 75" length keeps it practical for EDC in a belt sheath. This is a straightforward working knife for those who want a robust multi purpose blade without compromise. 12. 75" overall. 6.