【Length】Length of 8 inches / 20cm 【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 6061 aluminum alloy, well finished and precise CNC processing, sturdy and durable