Neewer 24"/60cm DSLR Camera Track Dolly Slider Ball Bearing Stabilization Rail System 176oz/5kg Load Capacity, Perfect for Photography and Video Length: 24"/60cm Max Load: 176oz/5kg Screw Thread: 3/8" (3/8" to 1/4" Mounting screw included) SlideCam DSLR Camera Track Dolly Slider