UpTern Lock BackTextured forefinger choil and thumb ramp Stout stainless steel handle, a sturdy back lock mechanism Fully configurable four position pocket clip Available in a choice of PlainEdge or CombinationEdge The byrd Tern is a non locking folding knife that strikes an exceptional balance of convenience, cutting performance, and unmistakable Spyderco style. Inspired by that synergy, we have adapted its design to a lock back format to create the Spyderco UpTern.