21027 Support rod standing pulley and desk-side cl

Inner packs dimension (L*W*H CM): 23.8*9*7.1

It consists of support rod, single pulley, desk-side clamp, and small iron ring and nylon wire. The height of support rod is adjustable. It is used to prove that the standing pulley can’t save effort but can change direction; the movable pulley can save half of effort but can’t change direction of force.