what makes three sisters forge unique?

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Heat Treat.

all handmade by one person by one hand

An added level of refinement

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Lockbars getting jammed or wearing out/improperly on frame lock knives at the production level is one of the most common issues. At TSF the lock bar face is impregnated with a coat of tungsten carbide which makes the lock more solid & last much much longer. This ensures a knife that lasts longer & is more consistent when opening & closing that won't ever jam on you.