ROCK CLIMBING Our lightest locking carabiner New screw gate is lightweight and easy to handle Slim nose profile features our proprietary SphereLock closure Laser etched marking to indicate if the lock is open or closed Available in 2 colors The Photon Lock is the anchor carabiner of choice for alpinists and multi-pitch climbers. Its full-size design gives it great versatility for any kind of climbing. I-Beam construction delivers a high strength-to-weight ratio while still maintaining a rope friendly radius. The proprietary SphereLock nose makes clipping ropes, webbing, chains and pro easy.