AW 32"/80cm Camera Track Dolly Slider Rail System 22lbs/10kgs Load Capacity for Stabilizing Photography Video Recording Easy to carry and use, set up in minutes Bubble level indicator to show how straight or angled the slider is positioned Base plate with 1/4" and 3/8" screw threads optional to connect to your camera, DV Three sets of 1/4" and 3/8" female screw to be match on tripods Two removable and adjustable feet for low level shooting