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Thumb Screw Hardware
DC Ground: YES
The perfect sportfishing companion
No more changing fuses
Tough construction with solid aluminium handle
Harken 57mm High Load Runner Block Boat VX Thumb Screw HardwareRunners are used on running backstays of offshore boats to adjust mast bend for different wind conditions. Integrated sideplate bails and recessed cotter key help produce a smooth design that wont snag lifelines. Sideplates and sheaves Hard Lube anodized for maximum UV protection and a smooth surface. Center cage keeps Torlon roller bearings separated and parallel to reduce friction. Torlon is a registered trademark of Solvay Advanced Polymers L. L. C.