Black Diamond RockLock Twistlock Review

The Black Diamond RockLock Twistlock is a large HMS style locker that is versatile for nearly any purpose, but specializes in belaying and rappelling. Because it can be used for so many different things, and is also very secure due to its auto-locking gate, we think it makes for an excellent first locker, and is useful for nearly everyone. Most climbers should find no reason to need more than one, though, as it's likely more practical to round out the rest of the rack with lighter and smaller offset-Ds.