The 39.4" Camera Slider from Manfrotto is a sturdy, portable solution for adding short-length tracking shots and subtle motion to your videos with loads up to 22 lb. It features high-precision steel ball bearings and quiet PSU polymer wheels for smooth camera carriage slides and an adjustable friction system to dial in the right amount of resistance for each slide. The carriage has a maximum travel distance of 34.2". The slider is constructed from machined anodized aluminum and weighs 6.5 lb. It can be setup on any flat and level surface or mounted on a tripod via the 1/4"-20 and 3/8"-16 threads at the center and ends of the tripod. The threads also allow you to attach a variety of optional accessories, such as articulating arms and Manfrotto's Digital Director.