Patuo Camera Aluminum 15mm Rods 10 Inches Long with M12 Thread for DSLR Camera 15mm Rods Railing System, Black Anodized (Pack of 2) Pair of 15mm rods for camera rod railing system. With M12 inner threads on both end for extra rod extension with M12 screw(Not included). Size: Industry standard 15mm diameter. Length: frequently-used 10inches (25cm) Material: Aluminum alloy construction. Black anodized surface treatment for high durability. Lightweight!Net weight:57g/pc.