Ravelli ATD Tripod Dolly for Camera Photo Lighting Metal Ball Bearing Casters with 3 Rubber Wheels and Step Function Locking Sliding Adjustable Leg Locks with Maximum Diameter spread of 36 Folding Design with Adjustable Length Legs and Carry Handle and Carry Bag Allows for Relatively Smooth Rolling Movement but Not Jitter Fee Video Movement Ravelli Lifetime Warranty