Description: 38x250mm Telephoto Lens Tripod Quick Release Plate Rail Slider Kit. Specially for 200-500mm, 150-600mm, 400mm, 500mm, 420-800mm lens. Horizontal Plate: 250mm length, 38mm width, 230mm slide length. Two-way card slot, with indexing scale, for Arca Swiss standard. Three-way Spirit Level: support multiple photography angles, horizontal, vertical, overhead, etc. 1/4" & 3/8" screws: for Canon, Nikon, Sigma, Tamron camera lens and tripod / monopod ball head, stabilizer rig, etc. High quality aluminum alloy material, light weight and durable. Specification: Material: Aluminum Alloy Size: 31x6.5 cm/12.2x2.6 inch Vertical Mount Size: 15cm/5.9inch Package Includes: 1x Quick Release Plate Mount Kit