Zircon Block, 40mm Single w/ Bkt - 2191

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 don't bunch, touch, and stop each other. The result is the most efficient small boat block Harken has ever made. Zircon blocks are available in 40mm and 57mm sheaves in single and double blocks, with or without beckets. Specifications Sheave √ò 1-9/16" 40 mm Length 2-7/8" 73 mm Weight 0.93 oz 26.5 g Maximum Line √ò 5/16" 8 mm Maximum Working Load 250 lbs 115 kgs Breaking Load 750 lbs 340 kgs