Specifications: This ?Force and Mechanics? item is used for the study of basic mechanics. When users spin the handle to the right, the mass will move forward, and when spin to the left, the mass will move backward. This set consists of spiral metal 26 cm in length. The set includes a 2 stainless axis 32 cm in length, in which the mass is hung over at the spiral. The mass is able to move forward and backward. The stand is 20 cm in height, and it is held on a wooden base of dimensions 45x35x10 cm.