Faders Walker Aluminum Screw gate locking carabiner. This Large D Screwgate locking carabiner has a pin gate, measures 4 1/2" on the long axis,  The gate opens to a huge 7/8" allowing easy clipping of bolts, ropes, runners, tools, or lots of gear. Weighs only 3.0 oz. assuring you're not weighted down while climbing your big routes. The locking carabiner give you assurance and confidence when a non locker is not enough. Super strong at 24 kN.