The Shield Quickdraw utilizes DMM's one of a kind Wirelock design to allow super easy clipping in the most desperate situations. The Wirelock gate has low mass to keep it from fluttering open in a fall, and the keylock notch makes clipping and unclipping far easier than with standard carabiners. Though the Shield Quickdraw is great for sport and trad climbing, the freeze proof gates and water repellant Dyneema sling also make it ideal for ice and alpine climbing. DMM made this quickdraw out of aluminum for a low weight of 2. 7oz, so it won't weigh down your harness when you start up the ninth long pitch of the day.