Closed Type Pulley Block Double Sheave With Hook 7512-LG RIGGING®, also known as lifting pulley.
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.
It's forged from high-quality steel, groove design is responsible. With the coating treatment of the surface, it will not hurt the rope and reduce power loss.
They are widely used in installation in construction.