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even when the user won't sit still
including Spinlock Deckvests
Controls two bilge pumps
0°+/-10% (-3 dB width nominal)
Prevents water spots on all surfaces
Harken 57mm Double Zircon Block with Becket Boat Thistle even when the user won'tThe Harken 57mm Double Zircon Block with Becket allows trimmers to quickly adjust sail shapes for varying conditions. At its core, this high performance block utilizes industrial ceramic ball bearings housed in separate cages to prevent friction and maximize efficiency. Available with 40 and 57 mm sheaves, in single or double blocks, and with or without beckets, this is Harken's most efficient small boat block yet. With a maximum working load of 300