PETZL - Demi Round, Semi-Circle Quick Link for Climbing INTENDED USE: The DEMI ROND quick link is designed to close harnesses that have two attachment points. Must be closed with a wrench for a secure connection. SIZE AND STRENGTH: This quick link has a 10 mm gate opening and a major axis strength of 25 kN. EASY TO USE: The rounded, half-circle shape facilitates easy rotation. DURABLE: Made from heavy-duty aluminum that's tough enough to hold a harness. WEIGHT: The DEMI ROND steel quick link weighs 55 grams.