Harken Aluminum Low-Load Double Swivel Block - 57mm Johnson Pumps Fastener size 3/8" FH

Fastener size 3/8" FH

and digital multimeters

Mid-range blocks can be used† for mainsheets

and composite fiber-reinforced side plates

Shake bottle before using

Harken Aluminum Low-Load Double Swivel Block - 57mm Johnson Pumps Fastener size 3/8" FHThe 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.