Double ratchet block with swivel for sailboats (max. line ø : 10 mm)
2634 Harken

The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is seamless. Unloaded main and jib sheets run out freely during mark roundings and asymmetrical spinnakers free instantly during jibes.
Ratchet engagement may be adjusted to a higher or lower load according to strength and sailing style. The Ratchamatic® cheek block mounts on either port or starboard. The holding power of the 57 mm is as high as 10:1. The 75 mm is up to 15:1.
For the ultimate system, mount a Ratchamatic® on the boom above a cockpit- ounted switchable ratchet to allow the mainsheet to run freely in light air and to double holding power in heavy air.
Use the 2634 with a 402 or 403 swivel arm for a versatile two-speed mainsheet system.