The Apex is a mid-line attachable pulley that secures the rope using a low-profile, patented, triple-action lock mechanism. This lock is operated by three distinct actions: pivot the lock button, depress it, then swing open the side plate. Simply closing the side-plate re-engages the lock mechanism and solidly secures the rope. The operation is intuitive and ergonomic. The Apex features symmetrical side-plates which are optimized for integration with prusik-based progress capture systems. This streamlines system set-up and minimizes the possibility of mis-rigging. The swivel eye on the 1.1" was designed to accommodate a single carabiners. It is also soft-goods-compatible for situations where you want to eliminate the carabiner altogether. The U.S. made Apex Pulley line represents the new standard for rescue, rope access, or arborism.