Karabiner with reinforced construction for JOKO progression lanyard The VERTIGO WIRE-LOCK carabiner is designed for use on the ends of JOKO lanyards. Its excellent grip and automatic WIRE-LOCK locking system, with Keylock, facilitate handling when passing intermediate anchors. The reinforced construction of the Keylock system reduces the wear effect of vibrations, and the hard anodization provides greater resistance to damp and salty environments.