This Harken 57 mm Carbo Double Ratchamatic block is an automatic load-sensing ratchet block for the efficient handling of sheets and trim lines on board.
The block rotates freely in both directions under light loads and automatically engages the ratchet function as the load increases. This provides better control and less strain on the crew during active sailing.
With a 57 mm sheave, a maximum line size of Ø10 mm, and a holding power of 10:1, it is well-suited for demanding trimming tasks where low friction and a secure grip are essential.
Key features
Automatic load-sensing Ratchamatic function
Free rotation in both directions under light load
Ratchet function engages automatically under higher loads
Holding power 10:1
Maximum line Ø10 mm
