Rock Exotica P53 Omni-Block 2.0 Inch Swivel 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. Max Rope Diameter: 13 mm Sheave Diameter: 2.0 (51 mm) It also allows installing/removing the rope while the pulley is still anchored. Certification: CE Breaking Strength:2 x 18 kN=36 kN Working Load:2 x 4kN=8 kN