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This tow truck lift consists of a number of moving parts, so please pay attention to the photos that show the operation, and placement of pieces. If at all possible, I strongly recommend that all pins be replaced with stronger materials such as styrene rod, metal etc. The main lift will rise and lower, with pin to set whatever height you prefer. It also tilts. The actual boom parts will raise and lower, as well as extend. Should there be a question or comment, contact me via the designer link or direct via email to email@example.com