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【High Quality】: A Crane Pulley Block is a kind of hoisting tool, also called a sheave, is a mechanism composed of a wheel on an axle or shaft that may have a groove between two flanges around its circumference. 【Material】: Zinc alloy 【Advantage】: Durable, strong, reliable, waterproof, anti-rust, anti-high temperature, corrosion resistance. 【Function】: Designed for hanging weight things to lighten load. 【Multi-Usage】: Widely used in tractive effort of steel wire rope or other rope tools.