Harken Aluminum Swivel Block - 57mm Navigation 1-1/4" sizes and larger include

1-1/4" sizes and larger include one grease zerk fitting (can be used for lubrication or for draining)

Provides approximately twice the working time of 206 Slow Hardener

Product formerly known as Zinc Coat Barnacle Barrier

Internationally approved navigation lamps

Harken Aluminum Swivel Block - 57mm Navigation 1-1/4" sizes and larger includeThe 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.