Andoer 20.5"/ 52cm Extendable to 41"/ 104cm Retractable Camera Video Slider Dolly Track Rail Stabilizer Load Up to 8kg for Canon Nikon Sony DSLRs Camcorders 52cm track, 104cm actual sliding distance, load up to 8kg. Super smooth transporting belt and track design. Qualified aviation aluminum alloy, CNC technics, preciser and more stable. 1/4" and 3/8" screws built-in the top for connecting with camera or ball-head. 1/4" and 3/8" thread holes built-in the bottom for connecting with tripod.