L M.wrote a review of Black Diamond RockLock Twistlock Carabiner on September 2, 2017
The item is well constructed and strong. It has a "twist lock" which is good for better security.
However the item is rather big and bulky for what I intended to use it for.
I just wanted the gate opening to be 1" so that I can put it on my bike handlebar to hang a whistle and a small wrench .You'd be surprised how hard it is to find a carabiner that has a gate opening of 1 inch. They are either too big or too small, even those "S-shaped" carabiners. They are expensive too. This one was of a good price considering from other stores. However though I think this is a well made item, I will probably return it. I need something of a more conpact design and I feel that the price I paid for it, as comparatively affordable as it was, is too much for the simpler design that I need.