For yachts over 12m (40ft) Allow mainsails to be reefed or dropped with ease, by retaining the sail between lines running from the mast (near the hounds) to the boom. These lines can be slackened whilst sailing to avoid restricting sail shape. Ideal for use with fully battened or conventional mainsails, these complete kits contain stainless steel, plastic-coated wires with blocks and fixing eyes attached. High quality braided line, all fixings and comprehensive fitting instructions are also included. A unique feature of Barton lazy jack kits is the soft plastic block covers which prevent sail chafe and enhance appearance.