Arborist-specific: ARBUSR-128-A3TU US Rigging USR-128-A3TU ProClimb Copper Head Climber Aluminum Carabiner - Triple Locking. Very lightweight - made from aluminum. Features & Specs: MPN: USR-128-A3TU Hybrid design is in between a "D" and HMS shape, works great for fliplines and lanyards Made from aluminum, very lightweight - 3.4 oz Triple-locking gate means three steps are required to open the gate, making it very safe and secure 114mm x 73mm 23mm Gate Opening 24 kN 5,395 MBS Snag-free design at gate opening Cool anodized finish with a unique copper appearance