The lightweight OK carabiner is made of aluminum. It has an oval shape allowing optimal positioning of devices with a large section such as pulleys, ascenders and mobile fall arresters. Its fluid interior design and the Keylock system facilitate handling. It is available in three locking systems: automatic TRIACT-LOCK and BALL-LOCK systems and manual SCREW-LOCK system. OK can be combined with the CAPTIV bar to promote stressing of the carabiner along the major axis, limit the risk of overturning and secure it to the device.