This is a pair of 12'' industrial standard 15mm rod, made of quality aluminum, very solid especially for heavy rig building. Threaded with M12 hole on each end of the rod, allows you to extend the length with another rod via M12 screw connector. Specifications: Material: Aluminum Alloy Weight: 158g Rails length: 30cm/ 12inch Rails diameter: 15mm Package Includes: 2 x 30cm/ 12inch 15mm rod