Trailer Tongue Jack; Electric A-Frame Round ACME Screw Jack; 3500 Pound Capacity; 2-1/4 Inch Diameter; 24 Inch Travel; 18 Inch Lift Height; Bolt-On Mount; Hardened Steel Gears And Stainless Steel Fasteners; 12 Volt Operation; Internal Automatic Thermal Protection; With An Emergency Crank Handle/ 3 Multi-Bulb Worklights/ 3/4 Inch High-Strength Drive Screw/ Smart Stop Technology To Prevent Hard Stops.