Wichard Proline Elastic Tether Hook/Loop - Single 4.5' [7038W]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