Kwikee (902809025 1-Step Kwikee Automatic Electric Single Step. Solid Steel 3/4 drive rods and stainless steel bushings Kwikee 12-volt automatic steps are designed to take the work out of entering or exiting from recreational vehicles An automatic safety stops the extension or retraction if the step meets resistance The engine does not have to be running to activate the step Rise 7 inches, Run 10 inches, Tread 24 inches, Mounting Bolt Pattern : 8 x 22 inches