Extension rod measuring 30-300mm in length, with external thread ranging from 1/4inch-20 inches at the top and internal thread ranging from 1/4-20inches at the bottom, used for connecting other products. Standard 1/4-20 male stand can hold external monitors, microphones, lighting, and many other accessories. Aluminum alloy, ensuring daily use,, durability, lightweight, small structure, easy to carry and use. Featuring thread, easy installation, and stability. Camera stand screw adapter, the camera to a tripod or microphones stand, holds the camera or microphones in a stable position, and is suitable for any camera tripod, monopod, , camera equipment, lens collar, lens plate, and lamp holder. 12mm outer diameter tube with 1/4 male and female end, sports camera accessory, 30-300mm long, used for connecting photography systems.