52.3" Extended Length 28.3" Compressed Length [From center of Mounting Holes] 12 Volt 24" Extension. 225 Pound Max Lift. Speed: 12mm /second. 6mm Diameter Mounting holes 20mm Diameter Shaft Wiring included and pre-installed Built-in clutch prevents over-extending and over-compressing. Includes 2 mounting brackets, 2 pins, and 2 cotter pins.