Harken Aluminum Low-Load Double Swivel Block - 57mm Johnson Pumps Mid-range blocks can be used†

Mid-range blocks can be used† for mainsheets

If the boat is in the water year round you should have a diver in the water at least once a year check anodes

Sheave Dia 2" (51 mm)

Height (in) 2 1/2

Harken Aluminum Low-Load Double Swivel Block - 57mm Johnson Pumps Mid-range blocks can be used†The entire line of Black Magic Air blocks 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 Black Magic blocks, the three way head swivels locks in front side positions. Blocks are easily disassembled with a single hex wrench.