The Davis & Sanford W3 Universal Folding Dolly with 3" Wheels is an adjustable tripod dolly with 3" ball-bearing rubber/metal wheels. It features a 35 lb load capacity and can be used with all standard tripods. It can conveniently be folded up to a compact 24" x 7" for transport and has a carry handle. The 3" wheels have "step on brakes" that lock and unlock their rolling and swivel movement.