Ok Screw-Lock

The OK Screw Lock from Petzl is a light, symmetrically shaped or oval locking carabiner that can be opened even in difficult conditions, such as mud or ice, thanks to the Screw-Lock locking system. A red indicator is visible as long as the carabiners are not locked. The carabiners are designed for optimum positioning of rope pulleys, rope clamps & pulleys with a backstop.