The metal GPT planetary gearhead family offers compact dimensions, high torque and fine graduations of numerous gear ratios. The gearheads tolerate frequent and sudden load changes and operate with high efficiency, can be combined with different motors and enable various shaft configurations. They are available with diameters of 22, 32 and 42 mm and can be equipped with as many as four reduction stages. The gearheads have many gear ratios with uniform distribution. As a result, motor power can be used optimally: a higher torque can be achieved with the same input speed, and a higher speed can be achieved with the same torque.