The standard twist lock (most auto-locking carabiners)
The more traditional twist lock design consists of two main types:
1. The standard twist lock (the auto-locking carabiner in the video above) requires 2-operations (2-stage) and opens with a twist followed by pressure on the gate. Other common names include 2AL, quicklock, Triact-Lock, and 2Lock.
2. The other, more complicated, twist lock type is a 3-operation (3-stage) locker, requiring a pull, a twist, and then pressure on the gate to open. These are also referred to as triple lock, 3Lock, Locksafe, or Auto 3