Closed Type Pulley Block Double Sheave With Eye 7512-LG RIGGING®, also known as lifting pulley.
Pulley and Block are common lifting mechanisms used for rigging and can usually use with wire rope.
It can change the direction of pulley, steel rope and can lift high-weight cargoes, especially series of pulley combined with windlass, mast and other lifting machinery.
They are widely used in installation in construction.