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 cages 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.
| Sheave Ø (mm) | 57 mm |
| Sheave Ø (in) | 2 1/4 in |
| Length (mm) | 95 mm |
| Length (in) | 3 3/4 in |
| Weight (g) | 51.4 g |
| Weight (oz) | 1.81 oz |
| Maximum line Ø (mm) | 10 mm |
| Maximum line Ø (in) | 3/8 in |
| Maximum working load (kg) | 150 kg |
| Maximum working load (lb) | 330 lb |
| Breaking load (kg) | 450 kg |
| Breaking load (lb) | 990 lb |
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