These gear motors feature a Hansen size 19 step motor on a pear shaped gearbox. Nearly 3,000 unique gear ratios are available from 5.3:1 to 72,000:1. The thinner, standard duty, gearbox can handle intermittent torque levels up to 80 in-oz and continuous torque up to 40 in-oz. The thicker, heavy duty, gearbox can handle up to 200 in-oz intermittently and 100 in-oz continuously. Consult the factory for your exact needs. Optional Features: Voltages up to 240 V, Custom leads and terminations, Custom stepper motor outputs.