CACAGOO CS-V500 Retractable Video Slider

Features:
Twice as original sliding distance, conceptionally retractable.
8pcs Ball-bearings design, multiple adjusting way of sliding tightness.
Sliding Stopper built-in.
Super smooth transporting belt and track design.
1/4" and 3/8" threads built-in the bottom for connecting with tripod.
1/4" and 3/8" screws built-in the top for connecting with ball-head.
Built-in Spirit Level.
High precision CNC technics.