Favored by skippers and crew, Harken Battcar systems let you raise, douse, and reef the main instantly from the cockpit, even when close reaching in a big breeze. Battcar systems outperform in-mast or in-boom furling, cost far less, and sails don’t need to be recut. Harken’s award-winning Switch T-Track Battcar system cuts the stack height of mainsails by half, making it much easier for crew to put on sail covers and to connect/disconnect halyards. This simple, yet sophisticated switch system neatly stacks cars side-by-side on top of the boom. The unique switch plate has no moving parts, ensuring an exceptionally reliable and efficient product. 18 mm standard system fits boats: Monohulls 11 - 13.5 m (37-45'); Multihulls 9 - 10.5 m (30-35') 18 mm high-loadsystem fits monohulls 13.5 - 15 m (45 - 50'); Multihulls 10.5 - 12 m (35 - 40').