The rockO is a blend of the traditional oval and the rockD giving it more strength than the standard oval. This design is great for users that need extra room at the bottom of the carabiner while keeping their gear aligned. The ORCA is a unique gate system that lifts up and twists just like many traditional auto-locks, but can be set to remain in the unlocked position. This allows the gate to open easily, just like a non-locker, but close with the security of an auto-lock.