Kessler Philip Bloom Series 3' Pocket Dolly Slider

From the Kessler site: The Philip Bloom Signature Series 3' Pocket Dolly is a hybrid slider that combines the lightweight portable rail & carriage system of a standard Pocket Dolly with the adjustable arc diameter handle and drag control of the CineSlider. Features include drag control and locking, handle with adjustable arc diameter for ultimate movement control, smooth rolling precision stainless steel ball bearing wheels, and multiple mounting options. The Philip Bloom Signature Series Pocket Dolly is smoother than other linear sliders due to its ball bearing wheel design.