No big tough folder thread would be complete without one of the humongous Cold Steel offerings.

The thickness on this one is circa Inkosi, while the yaller knife of thickness as original Sebenza, just for a helpful visual on those two, as well.

The weight is in between the Spyderco and Hinderer XM 24 in photo, circa XM 18 3.5" blade weight.

This one dates from back when CS and Spyderco had yet to screw metal clips to plastic, then the yaller knife barrel nut, then total screw assembly of knife, and then also heavier metal liner. Just the old simple one piece of plastic and two solid rivets for blade and lock. Nothing to strip, come unscrewtabled, life was light and breezy back then. A favorite. If you want something HUGE, light, flat, easy to carry, and strong, you will not go wrong with one of these.

Will leave obvious pivot diameter out of discussion, but every static test of lock strength still shows a lockback strongest, with handles breaking before lock fails, while bent metal locks invariably continue to curve, especially down low, and either free the blade or hopelessly jam it. As for how tough the Zytel handles on any, I know of a guy in northern Europe who left a plain edged version of my yaller knife outside all night at -65°F, brought it in and batoned with it, no problem, then smacked open knife handle sides with a hammer, and it cracked, but knife still serviceable.