Hi Mikhael, If there is ever a connection that is your only lifeline, i.e when you are rappelling on an Italian hitch, you should use a locking carabiner. This could be a screwgate, magnetron, twistlock or even a twin-gate but not a snapgate. Personally, I would recommend using a large HMS carabiner with an Italian hitch. This makes it easier to see if yo have tied it correctly and also makes the rope easier to manage. Any locking carabiner would technically be safe though. Hope that helps, Dave