This Axler 30" Lightweight Carbon Fiber Camera Slider is a lightweight easy-to-position slider, yet it can support loads up to 18 lb. The large carriage accommodates fluid heads and tripods of various sizes, and it glides smoothly along the 19mm rails. The carriage features four guide rollers that ride along the outside of the rails. Two additional rollers press against the inside of the rails and allow you to adjust the tension of the carriage. The carriage features a maximum camera travel distance of 26". In addition to a 3/8"-16 attachment screw, there are two sets each of 1/4"-20 and 3/8"-16 threads on the carriage that are useful for mounting optional accessories. At the ends of the slider are angle-adjustable legs with height-adjustable rubber feet for leveling on uneven terrain. an Allen key is included to adjust the carriage tension, and a padded carrying case is included to store and transport the slider.