Harken 57mm Aluminum Double Block - Swivel, Becket Description - The entire line of Black Magic® AirBlocks® has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same. These strong, lightweight blocks feature free-rolling high-load Torlon® roller bearings for a high strength-to weight ratio. Like all AirBlocks®, the three-way head swivels/locks in front/side positions. Blocks are easily disassembled with a single hex wrench. Sheave Ø (mm) - 57 Sheave Ø (in) - 2 1/4 Length (mm) - 152 Length (in) - 6 Weight (g) - 352 Weight (oz) - 12.43 Shackle pin Ø (mm) - 8 Shackle pin Ø (in) - 5/16 Maximum line Ø (mm) - 12 Maximum line Ø (in) - 7/16 Maximum working load (kg) - 1633 Maximum working load (lb) - 3600 Breaking load (kg) - 3267 Breaking load (lb) - 7200
