DMM Belay Master Carabiner - A really clever system - the Belay Master from DMM! The basic principle of the Belay Master is an HMS carabiner, but it also has a plastic safety bar!
The bar has two practical advantages: On the one hand, it prevents the carabiner from twisting in the safety loop and reduces the risk of lateral loads. This is a clear plus in terms of safety (and makes handling easier when belaying), both when belaying with a half-mast hitch and in combination with belay devices.
On the other hand, the bracket can only be closed when the screw cap is correctly tightened became. If you forget to close the carabiner, the protruding bracket will quickly remind you of the mistake!