Features: 1/4 female to female camera installation extension rod, extension rod for driving recorders and action camera, compatibility with 1/4 threaded camera accessories. Double 1/4-20 thread, with female thread on both ends, can seamlessly extend between tripods, car mounts, or camera arms. Wth reasonable structure, light weight, and long service life. It is the best alternative to plastic adapters Suitable for any DSLR camera tripods, monopod, microphones, telescope, lens board, lamp holder, etc. It can connect two photography devices together, helping you achieve much possibilities and degrees of freedom in device combinations during the photography process. 1/4 female screw hole to 1/4 female screw hole extension rod, used for various products such as selfie sticks, live streaming stands, camping lights, etc. Specifications: Material: Carbon fiber + aluminum alloy Color: black Size: 7.1cm/23.1cm/13.50cm (optional) Length: approx. 71mm/2.8inch, 231mm/9.09inch, 135mm/5.31inch Diameter: 21mm/0.83inch Tube diameter: 15mm/0.59inch Screw type: 1/4" internal thread to 1/4" internal thread extension rod Package Includes: 1 Piece Double Female Head 1/4 Connecting Rod note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.