SOG Knives & Tools Trident AT, Folding Knife, 3.7 Straight Clip Point, Black Handle, D2 Steel, Titanium Nitride Finish, Black SOG-11-12-05-41 A folding knife designed for professional users" Trident AT features rapid assisted opening with SOG's innovative ambidextrous AT-XR Lock" as well as integrated line cutter and glass breaker. Trident AT is easy to carry" with a highly functional 3.75" cryogenically heat-treated D2 stainless steel blade. Its powerful AT-XR locking mechanism also features built-in blade locking safety and spine-mounted safety system. The next evolution of the field-proven Trident pocket knife.