This Harken Zircon 57 mm double block with becket is an ultra-free-running block for sail trimming where low friction and precise control are essential.
The block is equipped with ceramic ball bearings, which provide extremely smooth running and make it particularly suitable for sailing in very light air.
With the becket, the block can be used in trim and control systems where extra purchase or line attachment is required.
Key featuresDouble 57 mm block for sail trimming
Becket for extra line routing or purchase
Ceramic ball bearings for very low friction
Suitable for sailing in very light air
Fits lines up to Ø10 mm
