The eye is small and there are many normal carabiners and maillons that will not fit through it. This is a fatal flaw, in my opinion. A tiny eye restricts versatility, and eliminates the option of using two carabiners for redundancy. Plan on dedicating a special carabiner if you want to use your .

The eye is machined for those annoying o-ring inserts that many canyoneers seem to love, but my came without o-rings. Good Riddance! I have plenty of proper-size o-rings in my shop, but I hate them and have no intention of adding them to any device that comes without them. You may disagree with me about o-ring eyes, I don't mind, we each have our reasons.