Standard stepper motor drives (with travel: 13 mm/load capacity: 4 kg., and travel: 25 mm/load capacity: 12 kg). Quickinstall stepper-motor drives (with travel: 8 mm and load capacity: 20 kg. General specifications for steppers motors: Maximum speed: 4mm/sec and Resolution: 50 nm. If you need further information, don't hesitate to contact us, please.