Bests & Worsts Reviews from Amazon

This thing has sharp edges at the attaching ring on the end of the shaft. If you attach a Carabiner it will be chewed up by this thing and sooner or later you will fall when it breaks. If you put a rope in it this thing will chew up your rope. As for the knurled fixture with the attaching ring there is a void all the way around the shaft where it looks like it was welded with gaps in the base material. I contacted the seller sending some pictures and the seller told me there is no reason why this unit can not be used. I have Rappelled professionally for my career and this is about the lowest thing I have seen to date. If you do not value your safety this is a good buy, but if you care about falling avoid this thing.