AI SAYS: The product is a vintage crane/ boom truck hand signal with a size of 14″ x 20″. This collectible item serves as a unique historical piece that can be used for educational purposes, teaching hand signals or operating heavy machinery. The item would make a great addition to a collection or educational display, offering a glimpse into the past and how communication was done on job sites. This sign is old school cool! Not only does it serve as an AWESOME piece of display art, it also serves as a training tool for learning some signals that are used in the field today.