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Description The pulley block is a kind of hoisting tool, also called a sheave, 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 application. Features - Brand: WINOMO. - Color: Silver. - Material: 304 Stainless Steel. - Size: About 3 * 2.5 * 7.2cm/ 1.18 * 1 * 2.83 inch(L * W * H). - Made of 304 stainless steel, durable. - Pulley rotation cylinder head is solid, durable, can rotate 360 degrees. - Dragging pulley, lifting pulley. - Surface shock light processing. - 304 Stainless steel Double Pulley Hanging wire towing wheel for driving fitness boat. Package Including 1 Pair* WINOMO Double Pulley Block