Material: Aluminum - Track Width: 40mm - Max Load-bearing: 25KG - Screw Size:3/8 - Adjustment: Damping Adjust - Internal Structure: Bearing type slippery course - Can match ball and Lamp bracket to use Product Features: 1. Precise slider a variety of functions Can level of shooting inclined shooting and vertical shooting 2. Carrying capacity of superit is suitable for most cameras and SLR cameras 3. With the function of adjustable resistance it is convenient to lock slide rail 4. Slippery course on both ends with collision damping elastic rubberwith functions of buffer shock gradually 5. Laser engraving scalepermanent will not fall offand can be more accurate when shooting moving the position of the slider