Here's what other sites are saying:
The symmetric shape of the Petzl OK Triact-Lock Autolocking Carabiner is especially useful when rigging hauling systems. The low-profile, glove-friendly Triact-Lock autolocking sleeve quickly snaps into locked position, and unlocks quickly with 2 motions for increased safety.
- Mountain Gear
The lightweight Petzl OK triact-lock autolocking H-profile carabiner has a symmetrical oval shape that lets you easily load devices that have a wide section like pulleys and ascenders.
Features of the Petzl OK Triact Lock Carabiner Symmetrical oval shape allows optimal loading of devices with a wide section, such as pulleys, ascenders and progress capture pulleys Fluid interior design limits the risk of having a catch point and facilitates rotation of the carabiner Keylock system to avoid any involuntary snagging of the carabiner H-profile contributes to better grip, protects the markings from abrasion and reduces weight Three different locking systems SCREW-LOCK: easy-to-open system, locking or not, according to the need of the user, the red band provides a visual warning when the carabiner is unlocked, this system is suitable for difficult environments where contaminants (mud, ice) could cause an automatic locking system to jam TRIACT-LOCK: automatic locking system designed for frequent manipulation. Triple-action opening by raising and turning the sleeve, then pressing on the gate BALL-LOCK: automatic locking system designed for frequent manipulation, with lock indicator Triple-action opening by pressing on the green indicator, turning the sleeve, then pressing on the gate, green button indicates when the gate is locked
Petzl Carabiners OK Locking Carabiner-Triact Lock M33ATL. This lightweight aluminum carabiner with a symmetrical oval shape allows optimal loading of devices with a wide section such as pulleys ascenders and progress capture pulleys. Available in three locking systems: Scew-Lock Triact-Lock and Ball-Lock.