At 41 grams, the Tgrango SuperFly Screwlock is the lightest locker available. Imagine: carry a handful and you'll never have to rig up an anchor without lockers; add them to the rope end of a couple of your 'draws and you can quit worrying about coming unclipped.

Specs:
Strengths: Major Axis (24kN), Minor Axis (7kN), Open (9kN)
Weight: 41 grams