These quickdraw set-ups combine one Edelrid Bullet carabiner on top and one Edelrid Bulletproof carabiner on the bottom.  The Bulletproof model is an innovative offset D-style carabiner with a steel insert at the apex of the carabiner to help prevent wear, burrs, or sharp edges from bolt hangers and ropes. Industry standard "keylock-style" closures on both carabiners helps prevents snagging when clipping on and off of slings, gear, ropes, and harness gear loops. An ideal style of quickdraw for clipping bolts and working routes.