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. Sheave Diameter: 2.0" (51mm) Weight: 20.9 oz (591gm) MBS: 40kN WLL: 10kN Max Rope: .5" (13mm) Certification: CE / UIAA