The 483 Studio Dolly combines height adjustable cable guards, for smoothing out studio floor litter, with independently controllable wheel tracking. The tracking system lets you lock and glide the 483 dolly in a straight line across the studio floor, and also lets you rotate your dolly in a circular motion by engaging a single wheel. A reinforced centre hub with collapsible box tubing arms. New, smooth action castors ensure the 483 offers sturdy, smooth support under all Miller ENG and HD tripods.</p>