Harken 57 mm Single Zircon Block Ideal 18 TABS -->Manufacturer part #: 433-108-01R

TABS -->Manufacturer part #: 433-108-01R

Manufacturer part #: RF144

low-friction performance with exceptional strength and durability

Length (in): 3 11/32

Fitted with a precision-engineered stainless-steel sheave

Harken 57 mm Single Zircon Block Ideal 18 TABS -->Manufacturer part #: 433-108-01RHarken 57 mm Single Zircon Block Zircon blocks help trimmers match sail shapes to new conditions immediately. At the core of the Zircon performance are industrial ceramic ball bearings mounted inside caged races. The cages keep these bearings separated so they dont bunch, touch, and stop each other. The result is the most efficient small boat block Harken has ever made. Zircon blocks are available in 40 and 57 mm sheaves in single and double blocks,