(R)EVOLUTION - CAPTIVE SYSTEM
The Captive system helps to keep the carabiner aligned in the right direction and reduces the risk of cross-loading.
Cross-loading happens when a carabiner is stressed on its minor axis, where it is much less strong than on the major axis.
Plume Captive carabiner:
Grivel products with Captive system: Captive carabiner, Plume Captive carabiner, Alpine Plume Captive quickdraw, Sport Alpha Captive quickdraw, Beta Captive quickdraw