Who says that being lightweight means a lack of structural rigidity? Who says that being lightweight means a severe limit to payload capacity? This new carbon fiber unit breaks all the rules. Featuring 21mm carbon fiber rails, the slider is lightweight at only 3.3 lb, yet able to support loads up to 18 lb. The large 4 x 5" carriage accommodates fluid heads and tripods of various sizes and glides smoothly along the rails thanks to eight sealed bearings on aluminum rollers, with a maximum camera travel distance of 40.5". In addition to a 3/8"-16 attachment screw, there are 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. A padded carrying case is included to conveniently store and transport the slider. Buyer to paqy shipping.