[ Length ] Length of 12 inches / 30cm [ Diameter ] The diameter of the rods is industrial 15mm standard [ Inner Thread ] M12 inner thread on each end of a rod, so that you can use M12 rod end cap (SmallRig 1617) to prevent your accessories sliding from rods [ Compatibility ] Mainly used on camera riser system and filmmaking accessories, such as matte box, follow focus, lens support, etc. [ High Quality ] Made of 601 aluminum alloy, well finished and precise CNC processing, sturdy and durable