This is a carabiner used only onece by a 10 year old kid for a cradle. The kid puts a tpae over a pull up bar in the door frame, clips the carabiner to the tape and to his harness swais alittle bit and finds it's self on the floor.
His mother brought the carabiner to my gym /she is not a climber/ and asked if this is normal ... !!!
From Petzl told us that the reason for that is misuse of the carabiner .. The kid wait is about 30 kg /60 lbs./ how can he brake a new top brand carabiner used for cradle ? The little guy is a good climber for his age and knows how to clip a draw /he can lead/
https://picasaweb.google.com/102592171217135028946/lofKP#5572179688238698386