Triple Sheave Walnut Sister Block 5/16″ (8 mm) (MS1313)
Triple Sheave Walnut Sister Block 5/16″ (8 mm) (2 per package) Blocks act as pulleys used in conjunction with the miles of line that make up the running rigging. They multiply the force exerted by the crew, enabling yards and sails to propel ships 2000 tons or larger. Note:Model blocks do not have scale sheaves. Instead, sheaves are represented by a hole in the block.
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