Summary: I have been using carabiners, pulleys and swivels in tree felling applications for a few years now. Have not used them in climbing applications.Observations: These are marked CE and EN, but I was not able to verify the authenticity of the markings.Recommendations: What is your life and property worth? Only you can answer that question for yourself. There are lots of name brand climbing equipment, with legitimate certifications.Pros: Decent fit & finish; smooth operation under no load.CoSee full review