1. Compatible with all AS specification quick release plates, such as for ARCA-, , KIRK, BuliMARKINS, Ma , Gang Rinpoche, , Siri, Hillertu, etc. 2. Using CNC precision machining 3. The guide rail is driven by a worm gear controlled by a knob, and the index scale in millimeters is printed on both sides of the guide rail to maintain consistency 4. Using high-quality metal materials, sturdy and durable 5. The camera can be installed on the top of the rail with an integrated 1/4 inch screw, which uses a 48 mm diameter thumbwheel to fix the camera in place 6. Helps to achieve accurate camera-to-subject distance Colour:Black+red Material:Metal Package Contents: 1 * camera rail slider Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.