Koolertron Professional 60CM Video Camera Slide Rail + Mini Dolly Stabilization System in Video Shooting For DV DSLR Video Camera Canon 550D 500D 600D 1100D 60D 50D 40D 5D 5DII 5DIII Nikon D300 D5100 D3100 D30 Red Anodized Slider Carrier Bubble Level The high-precision design of slide rail and block,make the sliding steadily and smoothly. Easy to Carry, easy to install, you can finish installing within minutes. It can match with tripods or on a flat surface with included feet. Adjustable damping system is convenient for regulating and locking.