Harken 57 mm Black Magic, AirBlock Double swivel/becket hi-load Cat. No. HAR 3218 Weight 1 lbs
$334.26
1961 BLK-57MM HL DBL W/BKT Use 57 mm Black
Magic® AirBlocks® on offshore boats. These strong,
lightweight blocks are sculpted aluminum, with Torlon® rollers and
carbon-black balls for strength and UV protection. Rollers are housed
in a unique center cage and are isolated for less friction. Blocks
feature a three-way head system and come in high- and low-load
configurations.
Use for:
Sheets
Halyards
Running backstays
Control lines
