Using this all-metal smooth-running contraption, the student immediately grasps a clear knowledge of the mechanical advantage of the wheel and axle. The wheel has a diameter of 35 cm, and the axle has three steps of 20, 10, and 5 cm diminishing diameter, all supported by ball bearings on iron brackets. The device is secured using holes in the base. On the wall. Includes snatch pulley block, cable, and hooks. Weighing is not included.