Andoer 16"/ 40cm Extendable to 32"/ 80cm Retractable Camera Video Slider Dolly Track Rail Stabilizer Load Up to 8kg for Canon Nikon Sony DSLRs Camcorders 40cm track, 80cm 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.