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This print repreasents a finish grade blade, or land plane as it is sometimes called, that acts as a grader attached to a skid steer bobcat type loader. The poles that stick upright are for guided positioning and help control the raising and lowering of the blade to ensure a level smooth surface. This piece has no operational parts due to size and print-ability. Should there be a question or issue, contact me via the designer link or direct via email to email@example.com