Designed for outdoor users" The Aegis AT pocket knife features rapid assisted opening using SOG's innovative ambidextrous AT-XR Lock with an ergonomic handle and grip pattern for comfortable use. Aegis AT is an easy to carry folding knife" with a highly functional 3.1" cryogenically heat-treated D2 steel blade. Its powerful XR locking mechanism also features solid built-in blade locking safety and spine-mounted safety system. The next evolution of the legendary Aegis assisted opening knife.