The SUPERFLY SCREWLOCK is the ultimate light weight locking biner - at 41 grams nothing even comes close! Now you can "season" your rack with a handful of lockers to increase your security at any clip without the weight gain. Close to full size (3 5/8" long by 2 5/32" wide) and super easy to handle - use anywhere saving weight is top priority - speed climbs, long Grade V & VI free climbs and in the mountains.