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Features:Package Content: 1pcs x Crane Pulley Block; Main Material: Iron;Weight: 48g;Sheave Size: 24x10mm/0.94x0.39 inch(D*T) ;Overall Size: 70x28x24mm / 2.76"x1.1"x0.94"(L*W*H);Sheave U width:6mm/0.24inch ;Accept Max Weight: 0.03T Description: 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. A rope, cable, belt, or chain usually runs over the wheel and inside the groove, if present. Pulleys are used to change the direction of an applied force, transmit rotational motion, or realize a mechanical advantage in either a linear or rotational system of motion.Designed for use with rope or cord in indoor and outdoor applications, but only pulley here, rope is not included.