The Mad Scientists have done it again. This time, we've taken an ordinary belay device and made it into a stylish, multipurpose device. The Mad Lock is engineered out of aircraft quality aluminum to create a lighter frame. 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 G-Strings to 11mm tactical monsters. What more can you ask for?