Kamerar 23" Inch Video Camera Track Rail Slider Stabilization System for DSLR DV Camera Photography and Video Recording with 1/4" 3/8" Screw All metal slider machined with a black anodized finish. Tough engineered with lasting durability. Smooth Slides up to 5 lbs. Four 1/4" Threads for Friction Arm. Red Anodized Slider Carrier w/ Bubble Level Kamerar's compound friction bearings guarantee the smooth noise-free operation. Compound Friction Bearings for Low Noise Tracking Adjustable Feet for Leveling. Use on a tripod or on a flat surface with included feet. For more information please refer to Kamerar website