1Made of high quality carbon fiber and aluminum alloy material, firm and durable, provide longer service life. 2There are 1/4-inch and 3/8-inch screw mounting holes on the bottom, which can be connected to various devices such as camera tripod accessories. 38 precision bearing stable structures can achieve smoother sliding and create smooth and noise-free videos and images. 4The level meter design effectively assists in smoothing the track to avoid shooting problems. 5Light in weight and compact in size, portable and easy to carry, will not occupy a large space. Item Type: Camera Slider RailMaterial: Carbon Fiber+Aluminum Alloy Size: Length: Approx. 40cm/15.7in Effective Travel Distance of Slide Rail: Approx. 37cm/14.6in Weight: Approx. 1060g/37.4oz Color: Black+Red Fitment: for Micro-Single Camera/ SLR camera Number of Bearings: 8PCS Load Capacity: 11.02 lb/5 kg (horizontal) Top Screw: 3/8in screw Bottom Screw Holes: multiple 1/4in, 3/8in screw holes Instructions: 1 Take out the slide rail and open the fulcrums on both sides 2: Take out the equipment that needs to be photographed and install it on the slide rail to use 1 x Slider Rail 3 x Hex Wrench