These patented devices revolutionized pulley use when they were introduced in 2005. The Omni-Block combines a pulley with a swivel and offers tremendous advantages. It can replace a conventional pulley, carabiner & swivel and is lighter, less expensive and saves valuable vertical space. It also allows installing/removing the rope while the pulley is still anchored. While the standard version serves the needs of most users, the Omni is also available with some specialized options. Featured in this video are the Omni-Block 1.5 Single Swivel Pulley, the Omni-Block 1.5 Double Swivel Pulley and the Omni-Block 2.0 Single Swivel Pulley PMP.