The Petzl Vulcan Screw Lock Steel Carabiner is high-strength and designed for use in difficult environments. The large capacity asymmetrical shape is ideal for setting multiple anchors. It may 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. The manual screw-lock with red band provides a visual warning when the carabiner is unlocked.