Use with the Harken Reflex torsion cable. For each additional sail, order these components separately so you can easily switch furled sails using the quick-release T-slot: one tack swivel, head swivel, Reflex torsion cable, and set of cable clamps. Unit 1 is rated at 1.5T MWL for boats to 11 m (36'). Unit 2 is rated at 2.5T MWL for boats up to 14 m (45'). Unit 3 is rated at 4.5T MWL for boats up to 17.4 m (58').