What is your opinion on the kettlestack system?

I bought a D-lock from my local bike shop and used that, could load it to 30kgs and do snatches with it quite comfortably. Cost me roughly a fifth as much.
 
I bought a D-lock from my local bike shop and used that, could load it to 30kgs and do snatches with it quite comfortably. Cost me roughly a fifth as much.

Ok, whats a d-lock? And how does that wokr(same principle as kettlestack?) and where can i buy one?
 
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