OK Lightweight oval carabiner The lightweight OK carabiner is made of aluminum. It has an oval shape that allows optimal loading of devices with a wide cross-section, such as pulleys, rope clamps and mobile fall arresters. Its fluid interior design and Keylock system facilitate handling. It is available in three locking systems: automatic TRIACT-LOCK or BALL-LOCK system, or the manual SCREW-LOCK system. OK can be connected to the CAPTIV bar to favor positioning of the carabiner along the major axis, to limit the risk of it flipping and to keep it integrated with the device.