This is a Hot Pod Dolly by Sachtler. It is specifically designed for use with the Hot Pod tripods. The Hot-Pod Dolly provides smooth and stable dolly action for all Hot-Pod tripods. Features fast-action foot-operated brakes, adjustable cable guards and is fitted with track locks to provide tricycle steering. 

A collapsed length of only 21.0" enhances portability, while the ergonomically designed carry handle is molded into the dolly's reinforced center bracket for optimum carriage strength.