Glad you asked...
A come-along is a ratchet lever winch device that winds a rope or cable around s pool. It has a break to keep it from unwinding. To use it find a strong anchor, often this is a tree or heavy vehicle. Wrap and secure the rope or cable around the object to be moved. Move the lever to start pulling the object about 1 to 3 inches per motion of the lever. Repeat as much as is needed. There is a button or switch with a cog to release the tension. You can find more information here: http://www.wisegeek.com/what-is-a-come-a...
Then again, this answer might help you...
A come along is an easy tool to use. This tool is used to level off freshly poured concrete. It is designed to be worked in push and pull motion, spreading the concrete

