Materials : High quality aluminum alloy + High quality stainless steel
T-Lock Transparent Lock ?
The key on both side are different.
Lock cylinder has openings cut into the pin chambers that allow you to see it work.
Lock with open chambers on all the moving parts that allow you to see how it work.
You can see clearly that how the pians work when a key is inserted.
In perfect smooth working condition with no loose parts or pins will come out.