Features:Provide 2pcs rail rod of 18cm length.With diameter of 15mm.Made of aluminum alloy with anodized coating and sand blast.An excellent choice for your DSLR camera cage / rig， follow focus and other support system.Specifications:Material: Aluminum AlloyRails Length: 18cm / 7.1inRails Diameter: 15mmItem Size: 18 * 1.5 * 1.5 / 7.1 * 0.6 * 0.6inItem Weight(single): 36g / 1.3ozPackage Size: 9 * 3.3 * 1.7cm / 3.5 * 1.3 * 0.7inPackage Weight: 73g / 2.6ozPackage List:2 * Alloy Rod