Ronstan Series 15mm Single with Becket Ball Bearing Block: Smallest and lightest ball bearing block available. Precision moulded acetal sheave running on stainless steel ball bearings provide high performance and low friction. Single loop head blocks include an O-Ring to separate running line from head lashing or fixing. Applications: Dinghy control lines Vangs, cunninghams and tweakers Shock cord tensioning systems Features: Sheave Diameter: 15mm Max Rope: 5mm Max Working Load: 120kg Break Load: 500kg Weight: 9g If this product is out of stock please contact [email protected]