24", 1000 lb Load, 32 Pulse, High Quality Actuators, easy to install, Single Screw Adjustment Limit Switches, water drains and vents through out for freeze protection. Pilot guide prevents binding and scraping. Long life ball screw or high quality acme screw actuation, 30% duty cycle motor ratings. High strength steel tube assembly with all-steel load support members, Tube surfaces and exposed metal components are specially treated for corrosion resistance.