Many pulleys need an oval-shaped carabiner to work properly. The OK carabiner is designed for just that. It's also very useful as a general purpose carabiner at belays.
* Symmetric share is ideal for use with belay devices To maximize efficiency no matter which end is closest to the device * Oval shape works great with pulleys * Keylock system * Available with manual locking system (SCREW-LOCK) or auto-locking system (TRIACT-LOCK)