The Petzl OK Screw Locking Oval is a symmetric carabiner: For use with pulleys and hauling systems. Symmetrical oval shape: facilitates pulley use, ideal for clipping anchors (easy to flip over).Compact shape: easy to use with one hand. Keylock System (snag-free body / gate interface). Available with manual locking system (SCREW-LOCK). Technical specifications: Strength: 24 kN long axis, 7 kN open gate, 10 kN short axis. Return Policy: Climbing equipment sales are final. In order to guarantee the life saving integrity of the climbing gear we sell -- we cannot accept returns on any life safety climbing or mountaineering equipment.