The center pole can be mounted between the tripod body and the head to expand the range of motion on the heads. Can be used to extend the elevator and assist in macro photography. The end is equipped with a movable hook that allows you to attach weights to balance the entire tripod Main Specifications: Height: 24.0 inches (610 mm); Pipe Diameter: 1.3 inches (32 mm); Tripod Mount Diameter: 1.8 inches (46 mm); Head Mount Diameter: 2.1 inches (54 mm); Maximum Load: 26.5 lbs (12 kg); Weight: 1.8 oz (520 g); Material: Carbon, Aluminum; Tripod Mounting Screw: 3/8 inch (3/8 inch (3/8 mm).