Product Name : Crane Pulley Block; Main Material : 304 Stainless Steel Weight : 435G; Pulley Size : 15 x 10mm / 0.59 x 0.4inch (D*E) Quantity : Monkey Pulley; Overall Size : 62 x 21 x 16mm / 2.4 x 0.83 x 0.63inch (L*W*E) Main Color : Silver; For Rope Dia. : 6mm /0.24inch Swivel Eyes Inner Size : 14 x 11mm / 0.55 x 0.43inch (L*W); Swivel Eye Thickness: 4mm / 0.16 inch A crane pulley block is a kind of lifting tool, also called a , is a mechanism consisting 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 passes over the wheel and inside the groove, if applicable. Pulleys are used to change the direction of an applied force, transmit rotational motion, or achieve a mechanical advantage in a linear or rotary motion system. Designed to be used with rope or cord in indoor and outdoor applications, but only a pulley here, the rope is not included. Package Contents: 10Pcs x Crane Pulley Block Only the