PETZL - Rescue, High-Strength Pulley with Swinging Side Plates INTENDED USE: The RESCUE pulley is very strong and efficient, making it ideal for rescue, hauling heavy loads, and intensive use. CONSTRUCTION: The large diameter sheave (38 mm) and sealed ball bearings provide excellent efficiency. EASY TO USE: The RESCUE pulley accepts up to 3 carabiners to facilitate use. HIGH STRENGTH: The RESCUE pulley has a working load of 8 kN (4 kN on one rope strand) and a breaking strength of 36 kN. DETAILS: This pulley weighs 185 grams. It's compatible with rope diameters from 7 to 13 mm.