Rock Exotica Omni-Block 2.0" Double Pulley 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. Sheave Diameter: 2.0" (51mm) MBS: 40kN WLL: 10kN Max Rope: .5" (13mm)