PETZL Delta Screw Link INTENDED USE: The DELTA quick link becomes a semipermanent anchor ring when closed with a wrench. SIZE AND STRENGTH: This quick link has a 10 or 12 mm gate opening (depending on style) and a major axis strength of 25 kN. DURABLE: The DELTA is made from heavy-duty steel that's tough enough to use as an anchor ring. OPTIONS: Available in three versions: rod stock diameter of 8 mm, 10 mm, or 8 mm with bar for positioning the CROLL on a harness. WEIGHT: The DELTA steel triangle quick link weighs 85 to 150 grams, depending on style.