Which D-ring for clipping safety line in cockpit

I would imagine that 6mm is too light for the job. 8mm far better. Folding type d rings have attractions of being flatter when down but must be a bit more difficult to attach to. U bolts should be fine except beware that a 8mm U bolt might be cut down to 6mm at the thread to stop the U pulling into the base. This stress raiser can initiate a failure. olewill
 
I also dont like the folding type. These require two hands to clip on. A rigid U bolt is much easier to clip into with one hand and there's space for a couple of clips.
 
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