Proline Elastic Tether Hook/Loop - Single 4.5&';Features: Tether with 1 double action safety hook - Elastic webbing - 1.40 m Automatic closing and opening mechanism The Proline generation has been designed to offer you the highest level of safety at sea Double safety hook: Automatic closing and opening mechanism Wide opening: 26 mm V-Nose feature (patented): easy hooking and unhooking High-quality elastic webbing: Retro-reflective and visible at night Compact and light Exclusive feature: SmartLoop The product can adapt to suit all needs and users SmartLoop lets you turn a single webbing tether into a double webbing tether and turn a double webbing tether into two single webbing tethers Material: Anodized aluminum hook offering lightweight and mechanical and corrosion resistance. Regulations: Compliance with ISO 12401:2009 and WORLD SAILING regulations (OSR) Overload indicator on all models Applications:Safety on board