This time, Mad Rock took an ordinary belay device and made it into a stylish, multi-purpose device. The Mad Lock is engineered out of aircraft quality aluminum to create a lighter frame weighing in at 92 grams. It has a unique design to provide an innovative new way to control speed of descent and look good while doing it. You can use it to belay the leader, the second, lock off, or even open beer bottles. The innovative 45 degree loading design allows for the belay to lower the second climber without creating a leverage advantage. The removable pin allows you to use ropes from 8.4mm floss to 11mm monsters.